Have a Care of Passion. Anger begins with Folly, and ends with Repentance.

Thomas Fuller (1654-1734) English physician, preacher, aphorist, writer

Introductio ad Prudentiam, Vol. 2, # 1856 (1727)
    (Source)

The second half of this is often attributed to Pythagoras, starting in the late 19th Century quote collections (e.g., 1891), but not in a recognizable form earlier.