The Ramban’s commentary on the opening posuk of Parsha Kedoshim is perhaps the second most famous Ramban on the Torah. Rabbi Noson Weisz explains the Ramban’s comments as follows:
“The lesson of the commandment to be holy is that we can be fully observant without necessarily being very different than the rest of the world in terms of pursuing materialism or leading a life devoted to consumption. We can open restaurants that are up to cordon blue standards and yet are strictly kosher. We can dress our wives and daughters in the latest fashions without violating the letter of the laws of modesty. We can aspire to live in mansions and drive fancy cars and spend our vacations in romantic far away places without violating any of the strictures of the Torah in the slightest degree. In short, observance does not foreclose the possibility of leading a materialistic life.
In fact, there is even a downside to observance in this regard. Whereas the non-observant person who engages in such a lifestyle has no illusions that he is leading a spiritual life, the strictly observant person who engages in the same life with minor variations might easily conclude that because he is observing the Torah commandments to the letter, he is immersed in spirituality even as he drowns in materialism. It is to forestall this attitude that the Torah urges us to holiness.”
Read the whole thing and spend some quality time with Parshas Kedoshim, which the Ramban calls the foundation of all the Aseres HaDibros.
Here is the outline from Rabbi Jonathan Rietti. Thanks again to Rabbi Rietti for allowing us to post these outlines. (You can purchase the entire outline of the Chumash here).
Kedoshim
# 19 Be Kedoshim!
# 20 Consequences of Major Violations
# 19 Be Kedoshim!
* Train yourselves to be in control of your cravings
* Fear Parents
* Observe Shabbat
* Warning against following Avoda Zara. 
* Don’t make a Pessel for others.
* Don’t eat Pigul
* Don’t eat Notar.
* Laws of Peah, Leket, Peret, Ollalot
* Laws of stealing, denial of rightful claims.
* Laws of Oaths:
* Laws of cheating in business & withholding wages.
* Laws against cursing.
* Laws of Justice.
* Laws of interpersonal behavior.
* Forbidden mixtures.ï€
* Forbidden practices.
* Behave with Awe in The Temple.
* Don’t seek mediums to communicate with the dead.
* Don’t seek out a Yidoni (to enter mystical states).
* Honor the elderly and Torah scholars.
* Don’t hurt a stranger or convert
* Love the convert like you love yourself
* Honesty. Don’t miscalculate, own honest measures.
# 20 Consequences of Major Violations
* Molech – Skila
* Inquiring after Ov – Karet
* Inquiring after Yidoni – Karet
* Cursing Parents – Skila.
* Adultery – Strangulation.
* Step Mother – Skila
* Daughter in law – Skila
* Homosexuality – Skila
* Mother & Daughter – Burning.
* Beastiality – Skila
* Step sister from father or mother – Karet
* Nidda – Karet
* Aunt – both die childless
* Sister in law – both die childless
* Don’t go in the ways of other nations.
* I separated you form the other nations to behave in a holy way.
* Act of Ov – Skila
* Act of Yidoni – Skila
