The Ramban at the end of Bo is a classic work on Jewish philosophy and probably the most quoted Ramban in Chumash. It’s well worth seeing inside. Here’s a summary:

Reason for the Plagues

The Ramban says that from the time of Enosh there were three types of heretics: 1) Those that didn’t believe in G-d at all; 2) Those that believed in a G-d, but didn’t believe He knew what was happening in the world; 3) Those that believed in G-d’s knowledge, but didn’t believe that He oversees the world or that there is reward and punishments.

By favoring the Jews and altering nature through the plagues, the falsity of the heretical views became clear to all. The supernatural wonders indicate the world has a G-d who created it, knows all, oversees all and is all powerful. And when that wonder is publicly declared beforehand through a prophet, the truth of prophecy is made clear as well, namely that G-d will speak to a person and reveal His secrets to His servants, the prophets, and with acknowledgement of this principle the entire Torah is sustained. (The Ramban brings down a number of pesukim supporting this.)

Reason for so many Mitzvos regarding the Exodus

Now, because G-d does not perform a sign or wonder in every generation in sight of every evil person and disbeliever, He commanded that we should have constant reminders and signs of what we saw in Egypt and we should transmit it to our children thoughout the generations. G-d was stringent in this matter as we see from the strict penalties regarding eating Chometz on Pesach and neglecting the Pesach offering. Other mitzvos regarding the Exodus are tefillin, mezuzos, remembering the Exodus in the morning and evening, Succos.

There are also many other commandments that serve as a reminder of the Exodus (Shabbos, the festivals, redemption of the firstborn,…). And all these commandments serve as a testimony for us through the generations regarding the wonders performed in Egypt, that they not be forgotten and there will be no argument for a heretic to deny faith in G-d.

The Reason behind Mitzvos in General

When one does a simple mitzvah like mezuzah and thinks about its importance, he has already acknowledged G-d’s creation of the world, G-d’s knowledge and supervision of the world’s affairs, the truth of prophecy and all the foundations of Torah. In addition he has acknowledged G-d’s kindness towards those that perform His will, for He took us from bondage to freedom in great honor in the merit of our forefathers.

That is why Chazal say, be careful in performing a minor commandment as a major one, for all of them are major and beloved since through them a person is constantly acknowledging his G-d. For the objective of all the commandments is that we should believe in G-d and acknowledge to Him that He created us.

Purpose of Creation

In fact this is the purpose of creation itself, for we have no other explanation of creation. And G-d has no desire, except that man should know and acknowledge the G-d that created him. And the purpose of raising our voices in prayer and the purpose of Shuls and the merit of communal prayer is that people should have a place where they can gather and acknowledge that G-d created them and caused them to be and they can publicize this and declare before Him, “We are your creations”.

This is what the sages meant when they explained “And they shall call out mightily to G-d” as from here you learn that prayer requires a loud voice for boldness can overcome evil.

Everything is a Sign of Hashem

Through recalling the great revealed signs of Hashem of the Exodus, a person acknowledges the hidden signs of everyday life which are the foundation of the entire Torah. For a person has no share in the Torah of Moshe unless he believes that all our affairs and experiences are signs from Hashem, that there is no independent force of nature regarding either the community or the individual.

Reward and Punishment

Rather if one observes the commandments his reward will bring him success and if he transgresses them his punishment will destroy him. Hidden signs of Hashem can be more clearly recognized as regards the affairs of a community as in the predictions in the Torah in the matter of the blessings and the curses as it says – And the nations will say, “For what reason did Hashem do so to this land…?” And they will say, “Because they forsook the covenant of Hashem, the G-d of their forefathers”. This matter will become known to the nations, that this is from G-d as their (the Jews) punishment. And it is stated regarding the fulfillment of the commandments, “Then all the people of the earth will see that the Name of Hashem is proclaimed over you, and they will revere you.”

Rabbi Moshe Feinstein in Darash Moshe comments on the mistakes of those who reject Torah leaders:

Korach’s argument, the entire congregation — all of them — are holy, and why do you exalt yourself over the congregation of Hashem, is the basic argument of those who reject the Torah leaders and think that they know the Torah as well as the gedolim, and they do not need a teacher or a leader.

As is manifest, all kinds of apostates find support for their erroneous views in some Rabbinic maxim. This is because they misunderstand the meaning of the Rabbis. Even the generation of the desert, upon whom the Shechinah rested, for they had heard the first two commandments of the Decalogue, still required Moses and Aaron and all the sages of the generation.

Rabbi Avigdor Miller ztz”l was one of the pioneers of taping and diseminitating shiurim and writing seforim for the English speaking public. I listened to his tapes and read some of his books, but I wouldn’t have called myself a chassid. That has changed.

TorasAvidgor.org has been producing a weekly parsha booklet, taken directly from the words of Rav Miller. Each parsha booklet is based on a wide range of the Rav’s tapes and seforim, and is edited slightly to allow for easier reading. For me, every week has been a homerun! It’s longer than the average parsha sheet, but it is packed with amazing ideas that you can actually implement.

Last week it discussed the idea that when we bless others, G-d blesses us, as G-d promised to Avraham, “I will bless those that bless you” (Bereishis 12:3). In the gemora Chullin (49a), Rav Nachman bar Yitzchok teaches that when the Kohanim bless the Jews, Hashem blesses them, and this applies to any Jew or non-Jew at any time. The gemora there learns that even if a non-Jew says “Good Morning”, he will receive a blessing.

Rabbi Miller teaches that if you say “Yasher koi’ach” with some thought of the meaning – “May your strength increase”, then you’re davening for him! Rabbi Miller continues: “Those words now have an entirely different power. And we’re learning now that it’s not going to remain unanswered – in your own life! You’re going to get a blessing for that too. In the measure by which you bless others, that’s how much you will be blessed.”
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“You’re walking on the street on Shabbos and you say, “Good Shabbos, good Shabbos.” All day long you’re passing by people and wishing them well. And then you pass by and forget all about it. It’s a tragedy to waste the opportunity! So five paces later say “Good Shabbos” to him again. This time he doesn’t hear it. But this time you mean it more.

“And under your breath you should add the peirush hamilos – with a few peirushim! How much thought, how many blessings could be included in a good Shabbos! “Your meals should be geshmak; your wife’s challah and kugel should taste exceptional.” “Hashem should help you enjoy your family.” “You should have a good Shabbos nap and be matzliach in your learning over Shabbos.” “You should get shlishi and it shouldn’t cost you too much money!” There’s so much to think about when you wish somebody a good Shabbos.”
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“But there is something else here that is very important – maybe even more important than what you just heard – and that is to rejoice in somebody else’s happiness; to have an actual love for the Am Yisroel – a love that causes you to desire the happiness of others.”
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“Hakodosh Boruch Hu loves His people more than anything else. And so when we fill our days with blessing the Am Yisroel because we love them, we are fulfilling the mitzvah d’oraisah of v’halachta b’drachav – “And you should walk in the ways of Hashem”.
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“If you want to become a big ba’al dei’ah, a ba’al machshava, a ba’al emunah, then there’s a lot of work to be done. In order to achieve middos tovos, to acquire good character, there’s training you must follow, a lot of important things. And they’re not easy, but they’re worth the effort.

But I’m not proposing that for all of you right now; I’m saying easier things. We’re learning here about an achievement that is immensely easy. And the profit is immensely great. And that is the career of blessing fellow Jews. Now, when I say career, I mean that you must take the ideas that you’re studying here tonight, impress them upon your minds, and consider how to incorporate them into your regular practice, your regular routine of life. Because with a little bit of thought and some planning, you can live a life of “I will bless those who bless you”. Because, tell me, what difficulty lies in this exercise of good character? Nothing really! It’s one of the easiest things in the world to do – to bless your fellow Jew.”
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“Let’s make it clear to ourselves that this is what we’re in this world for. We’re here to pick up all those diamonds on the floor. That’s our purpose. When a person is discouraged as he walks through the diamond fields, so he’s thinking that he has rachmanus on himself, he has pity on his status in life – “If only this would have happened;” “If only I would be in his shoes” – so he walks through life not even looking where he’s going”

Please read the whole article at https://torasavigdor.org/parshas-naso-blessing-his-beloved-people/

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One of the most famous Rambans in the Torah is on Vayikra 19-2, where the Torah says “You Shall be Holy”. Here is translation of that Ramban from Sefaria.

You shall be holy: “One should be separate from sexual transgressions and from sin, for any place that one finds a fence [before] sexual transgressions, one [also] finds holiness (kedusha)” – this is the language of Rashi.

But in Sifra, Kedoshim, Section 1, Chapter 2, I saw only, “You shall be holy.” And [so,] they learned there (Sifra, Shemini, Chapter 12:3), “‘And you shall sanctify yourselves and be holy, since holy am I’ (Leviticus 11:44) – Just like I am holy, you should be holy; just like I am separate, you should be separate.”

But according to my opinion, this separation is not to separate from sexual transgressions, like the words of the rabbi (Rashi). But [rather], the separation is the one mentioned in every place in the Talmud where its [practitioners] are called those that have separated themselves (perushim).

And the matter is [that] the Torah prohibited sexual transgressions and forbidden foods, and permitted sexual relations between husband and wife and the eating of meat and [the drinking of] wine. If so, a desirous person will find a place to be lecherous with his wife or his many wives, or to be among the guzzlers of wine and the gluttons of meat. He will speak as he pleases about all the vulgarities, the prohibition of which is not mentioned in the Torah. And behold, he would be a scoundrel with the permission of the Torah.

Therefore, Scripture came, after it specified the prohibitions that it completely forbade, and commanded a more general [rule] – that we should be separated from [indulgence of] those things that are permissible: He should minimize sexual relations, like the matter that they stated (Berakhot 22a), “That Torah scholars should not be found with their wives [constantly] like chickens.” And he should only have relations according to the need for his execution of the commandment.

And he should sanctify himself from wine by minimizing it – just as Scripture calls the Nazarite, holy (Numbers 6:5); and mentions the evil that comes from it in the Torah with Noach (Genesis 9:21) and with Lot (Genesis 19:33).

And so [too], he should separate himself from impurity – even though we are not prohibited from it in the Torah – as they mentioned (Chagigah 18b), “The clothing of ignorant people are [considered] midras (a type of impurity) for perushim.” And just as the Nazarite is also called holy for his guarding [himself] from the impurity of the dead.

And he should also guard his mouth and his tongue from becoming defiled from the multitude of coarse food and from disgusting speech, as mentioned by Scripture (Isaiah 9:16), “and every mouth speaks a vulgarity.” And he should sanctify himself with this, until he comes to separation (perishut) – as they said about Rabbi Chiya, that he never spoke idle conversation in his life.

For these [things] and similar to them comes this general commandment – after it listed all of the sins that are completely forbidden – until he includes in this general rule the command of cleanliness of his hands and his body. As they stated (Berakhot 53b), “‘And you shall sanctify yourselves’ – these are the first waters (to wash hands before the meal), ‘and be holy’ – these are the last waters (to wash hands after the meal), ‘since holy’ – this is fragrant oil (to ward off bad odors).”

As even though these commandments are rabbinic, the essence of Scripture prohibits things like these; that we should be clean and pure and separate ourselves from the masses of people, who dirty themselves with those things that are permissible and with those things that are ugly. And this is the way of the Torah to state the particulars and [then] the general rules.

And similar to this is when after the prohibition of the specific laws of trade among men – do not steal, do not burglarize, do not deceive, and all of the other prohibitions – it states the general principle, “And you shall do the straight and the good” (Deuteronomy 6:18), so that it places into a positive commandment, uprightness, compromise and going beyond the letter of the law towards the will of his friend – as I will explain (there), when I get to its place, with the will of the Holy One, blessed be He.

And so [too] with the matter of the Shabbat, it forbade the types of work with a negative commandment and the exertions with a general positive commandment, as it states, “rest”; and I will explain this more (Ramban on Leviticus 23:24), with the will of God. And the explanation of the verse saying, “since Holy am I the Lord, your God,” is to say that we merit to cling to Him by our being holy.

And this is like the matter of the first statement in the ten statements (Ten Commandments – Exodus 20:3). And it commanded (Leviticus 19:3), “A man, his mother and father must fear” [here], since there (in the Ten Commandments), it commanded about honor, and here it will command about fear. And it said [here] “and guard my Shabbats,” since there it commanded on the remembering [of the Shabbat] and here on the guarding and we have already explained the matter of both of them (see Ramban on Exodus 20:8).