What is your favorite Holiness passage?

Mine is probably I Peter 1:13-16

Wherefore girding up the loins of your mind, be sober and set your hope perfectly on the grace that is to be brought unto you at the revelation of Jesus Christ; as children of obedience, not fashioning yourselves according to your former lusts in [the time of] your ignorance: but like as he who called you is holy, be ye yourselves also holy in all manner of living; because it is written, Ye shall be holy; for I am holy.

For me, being holy is the opposite of being “common” or “worldly.” God is holy in that He is utterly and completely different and distinct from His creation. We must also be different, distinct, and separate from the worldly attitudes and actions that are so prevalent in today's society and that characterize the unbelievers.

I also like the KJV for a passage in chapter 2 and verse 9, in that it conveys an idea of being separate:

But you are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvelous light (1 Peter 2:9, KJV).

I have some more favorite passages on this subject (as you might imagine.) But this will do for now.

So, what is yours? And why is it your favorite?