The Torah, at Lev. 19:2, teaches "You shall be holy for I, Hashem your G-d, am holy." What is holiness in this context? Is it an achieveable goal, or must we observe the commandments perfectly? If the latter, does "perfect" mean 100 percent observance without mistakes, or does it indicate one did not sin intentionally? Also is "holiness" the same as "righteousness"? How does the meaning of these two words differ?
Leviticus 19:2 is part of Parshah Kedoshim, and so this is a common question brought up in dvar torahs. Here is a prompt based on the teachings of Rabbi Nachman of Breslov:
Rabbi Nachman (or what is based off of Rabbi Nachman) is not alone in his third requirement, to accept these easy "common-sense rules for getting along with others for the right reason." Rambam also reflects this too in Laws of Kings and their Wars 8:11:
Rambam here distinguishes between a pious one among the nations and a wiseman by how one comes about accepting the Noachide laws. If one comes about accepting them through compelling common-sense reason and logic, then he is only a wiseman as opposed to a pious man. This same line of reasoning is used in Rabbi Nachman's last requirement to achieve holiness.
I hope this helps. If you want, just search for other dvar torahs on Parshah Kedoshim with a keyword, "holiness," and you should get plenty of results.