Allusion su Levitico 19:78

And on the face of it, it is an impossible thing! How could the text say that all of the congregation of Israel should be holy! Holiness is beyond even the greatest among Israel, since not every person can merit to be called holy. And it is a positive commandment for every human. And this is extraordinary: even though every person is what they are, they can still be holy. And it seems that the explanation is that each, according to what The Holy One commands each person, that person needs to separate and comprehend their standing. The holiness of simple people is not appropriate for those who are in a higher standing, and a person who understands what for them is materialism and coarseness and separates themselves from it, that is holiness. But for those in a higher level that is not holiness at all, and a person in that standing needs to separate from other things, constantly - even if for the simple people their separating constantly from their materialism is real and great kedushah. And the general rule is that this is a general mitzvah but for each person it will look like a different mitzvah, as there is a different holiness, as each person needs to make holy their tendencies that their nature gives them.