On Anger, Book II, XXIV

Readiness to believe what we hear causes very great mischief; we ought often not even to listen, because in some cases it is better to be deceived than to suspect deceit.

We ought to free our minds of suspicion and mistrust, those most untrustworthy causes of anger.

“This man’s greeting was far from civil; that one would not receive my kiss; one cut short a story I had begun to tell; another did not ask me to dinner; another seemed to view me with aversion.”

Suspicion will never lack grounds: what we want is straightforwardness, and a kindly interpretation of things.

Let us believe nothing unless it forces itself upon our sight and is unmistakable, and let us reprove ourselves for being too ready to believe, as often as our suspicions prove to be groundless: for this discipline will render us habitually slow to believe what we hear.