—The Book of Ecclesiasticus

Thou may’st be sure that he that will, in private, tell thee of thy faults, is thy friend, for he adventures thy dislike, and doth hazard thy hatred; there are few men that can endure it, every man for the most part delighting in self-praise, which is one of the most universal follies that bewitcheth mankind.

—Sir Walter Raleigh

Once let friendship be given that is born of God, nor time nor circumstance can change it to a lessening; it must be mutual growth, increasing trust, widening faith, enduring patience, forgiving love, unselfish ambition, and an affection built before the Throne, which will bear the test of time and trial.

—Allan Throckmorton

Friendship is a field which one sows.

—Restif de la Brétonne

A man that is fit to make a friend of must have conduct to manage the engagement, and resolution to maintain it. He must use freedom without roughness, and oblige without design. Cowardice will betray friendship, and covetousness will starve it. Folly will be nauseous, passion is apt to ruffle, and pride will fly out into contumely and neglect.

—Jeremy Collier

Some look to friendship for absolute exemption from criticism, and for a mutual admiration without limit or conditions. Others mistake it for the right of excessive criticism, in season and out of season.