We know Christ is holy. We know we are called to be holy. We know holiness is connected with our behavior, and behavior is connected with our hearts, and our hearts are connected with our head.
"As obedient children, do not be conformed to the passions of your former ignorance,  but as he who called you is holy, you also be holy in all your conduct,  since it is written, 'You shall be holy, for I am holy.'" (1 Peter 1:14-16 ESV)
There are two important aspects to holiness: mortification and vivification. Mortification means killing sin in our mind, hearts, and hands. Vivification means imitating Christ in righteous thinking, feeling, and action.
Here is a good resource for discovering the depths of our sin through God's commandments, so that we may continuously mortify (kill) the flesh through knowledge, repentance, and confession.
Here is a helpful handout on understanding the work of holiness that God desires to accomplish within us!
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