Manners are the shadows of virtues; the momentary display of those qualities which our fellow creatures love, and respect. — If, we strive to become, then, what we strive to appear, manners may often be rendered useful guides to the performance of our duties.

Sydney Smith (1771-1845) English clergyman, essayist, wit

Sermon (1809 pub.), “On the Judgments We Form of Others”
    (Source)

Sermon on Leviticus 19:15.