Kommentar zu Wajikra 19:2

You shall be holy etc - Holiness is an expression of separation and an expression of belonging and invitation, that is, the Holy One of Blessing warns Israel that they will be separated from all things that carry idolatry, and are invited and belong to the service to the Blessed One.

You shall be holy. As I heard that in the parasha Kedoshim it opens with "you shall be holy" [also an explanation that it is a reassurance that they will be holy in everything that is written in the parsha] that is impossible for a person to do all the mitzvot written in the parsha if one is not holding oneself in holiness in what is written beforehand. And he said, as example, that "love your neighbor as yourself" is impossible to do, what can one do if in one's heart one hates the fellow nonetheless, or maybe just does not love the fellow, and all the exertions of one's heart will definitely not help if beforehand one has not reached the level of holiness.

"You should be holy because I Hashem your G-d am holy:" To explain this, this is similar to what our sages say that if there's is a letter that's used as a prefix to G-d's name that it can be erased, but if it's used as a suffix it can't be erased like the name Elokiechem because the letters are sanctified with the Name in the front. This hinted in the Torah as it says "you should cleave to Hashem your G-d" and "You should cleave to Hashem." What this means it that you should cleave to Hashem via mitzvot and good deeds. Our sages are alluding that even though one achieved devikut to Hashem that they have not reached the higher level and always stand in front of Hashem because a person like this can fall all the way down, chas veshalom. The real path is that a person shouldn't considered himself important at all. Even if they reached the highest level, they should think nothing of themselves like Avraham Avinu who said "I am but dust and ashe." and like King David "I have drawn my heart to do your mitzot and I will always still be a heel." What that means is even though I drew my heart to do miztvot and I reached the highest level, I am still a heel, the lowliest of people. This is also what it means when it says "I have not gone to do things which are greater than me and more wonderous than me." This what our sages mean when they say that a "prefix" which means secondary in Hebrew [in front and in the beginning of the word] what this means that he thinks that he is secondary and is attached and is always in front of Hashem he can fall [be erased]. But anything that is a suffix to Hashem, that he is lowly and humble and follows after Hashem, this kind of person will not be erased and will merit to cleave to Hashem. This is the meaning of the verse that "you should walk behind Hashem and cleave to Him"... and this is what the Torah means when it says "you shall be holy" if you're able to estimate yourself as being like the verse continues "I am Hashem your G-d is holy" when you consider yourself attached to Hashem behind, like -leichem, you should be holy. The Gemera says that in food if there's a primary part and a secondary part and that you should make a blessing on the primary part. What this means is make a bracha on the major part of Hashem's name and through this you'll elevate the first part of the Name. This is explains the story in the Gemara where R Chanina ben Doysa prayed for rain and R Yochanan Zachai confirmed why his prayers were answered. He said that [to R Chaina ben Doysa] "you're like a servant to behind" and I'm "like a minister in front of Hashem."