As iron sharpens iron, so a friend sharpens a friend.

Think where man's glory most begins and ends, and say my glory was I had such friends.

There are no rules for friendship. It must be left to itself. We cannot force it any more than love.

A man's friendships are one of the best measures of his worth.

My best friend is the man who in wishing me well wishes it for my sake.

There is nothing on this earth more to be prized than true friendship.

The sincere friends of this world are as ship lights in the stormiest of nights.

A man cannot be said to succeed in this life who does not satisfy one friend.

Never have a companion that casts you in the shade.

One of the most beautiful qualities of true friendship is to understand and to be understood.