Do not conform to the pattern of this world, but be transformed by the renewing of your mind. 
(Romans 12:2a – NIV)

So I tell you this, and insist on it in the Lord, that you must no longer live as the Gentiles do, in the futility of their thinking.   (Ephesians 4:17 – NIV)

Unfaithful creatures!  Do you not know that friendship with the world is enmity with God?  Therefore whoever wishes to be a friend of the world makes himself an enemy of God.  

(James 4:4 – RSV)

Do not love the world or anything in the world.  If anyone loves the world, love for the Father is not in them. 

(1 John 2:15 – NIV)