Distinguish Between the Clean and the Unclean

There is a refrain throughout the books of the Law and the Prophets that I have been pondering:

Leviticus 10:10
distinguish between holy and unholy, and between unclean and clean

In a recent Spiritual Snack (Be Holy, for I am Holy), I pointed out several of the scriptures in the Old Testament in which God commanded the Israelites to "be holy," along with an analysis of the New Testament appearances of the command to "be holy." This refrain in Lev. 10:10 about discerning holiness and cleanliness comes up quite a bit in the context of the scriptures that I referenced in that article. If God wants us to "be holy," we obviously must understand what holiness is first! The point of that article is that the answer is found in God's law. God's Law gives qualifications for holiness - if you do not follow the law, then you become unholy. An important distinction to make is that keeping the law does not make you Holy - God makes you holy out of His grace and mercy because of the fact that you demonstrate faith by attempting to do His will by keeping His law.