Tim Keller on Friendship

Friendship
Wise people are good at choosing, forging, and keeping friendships. The marks of a true friend are constancy, carefulness, candor, and counsel. When you are liberated to be the great friend you need to be by the great friendship of Jesus on the cross, then you will find yourself getting, paradoxically, all the friends your heart needs.

Spiritual Friendship
Spiritual friendships are needed by all people; are discovered
through the immediate bond of the love of Jesus Christ; are created through shared faith, prayer, possessions, feelings, and decisionmaking; and will last forever.