Anger is momentary madness, so control your passion or it will control you.

[Ira furor brevis est: animum rege: qui nisi paret imperat.]

Horace (65-8 BC) Roman poet, satirist, soldier, politician [Quintus Horatius Flaccus]

Epistles, Book 1, Epistle 2, l. 62 (c. 20 BC and 14 BC)

Alt. trans.: "Anger is a short madness." "Anger is a short-lived madness." "Anger is a brief lunacy."