“But as he which hath called you is holy, so be ye holy in all manner of conversation;”  
1 Peter 1:15

The Bible says:
“But of him are ye in Christ Jesus, who of God is made unto us wisdom, and righteousness, and sanctification, and redemption:”  1 Corinthians 1:30
Christ is your redemption; glory to God! What great news!! Christ is your sanctification, he is your separation. He sanctifies you and you live your life sanctified in and for him.
He is your distinction. What differentiates your communication with others, what is the sieve with which you choose your source and expressions in life- Christ.
He guides the kinds of meetings you attend, he guides what you think about yourself; through his word, you sanctify your mind:
“And be not conformed to this world: but be ye transformed by the renewing of your mind…”  Romans 12:2
Through his word, you sanctify your thoughts: Philippians 4:8
Through his word, you sanctify your words:
“Let no corrupt communication proceed out of your mouth…”  Ephesians 4:29
Through his words, your body parts are sanctified:
“…even so now yield your members servants to righteousness unto holiness.”  Romans 6:19
Including your friends:
“Blessed is the man that walketh not in the counsel of the ungodly, nor standeth in the way of sinners, nor sitteth in the seat of the scornful.”  Psalms 1:1