One cannot always choose his vocation or surroundings in the world. But one can choose his friends.
The philosopher Antisthenes used to wonder that men would examine carefully an earthen vessel which they were about to buy, worth just a few cents, to see if there were any cracks or flaws in it, and yet the same men would exercise no thought or care in the choice of friends.
When John Wesley was a student at Christ Church, Oxford, he made the resolution that he would have only those friends that would help him on the road to heaven.
"He is your friend who pushes you nearer to God." - Abraham Kuyper.
Jas 4:4 (KJV): "Ye adulterers and adulteresses, know ye not that the friendship of the world is enmity with God? Whosoever therefore will be a friend of the world is the enemy of God."
"The dearest friend on earth is a mere shadow compared to Jesus Christ." - Oswald Chambers.