An eye can threaten like a loaded and leveled gun, or can insult like hissing or kicking; or, in its altered mood, by beams of kindness, it can make the heart dance with joy.

Ralph Waldo Emerson (1803-1882) American essayist, lecturer, poet

Essay (1860), “Behavior,” The Conduct of Life, ch. 5
    (Source)

Based on a course of lectures, "The Conduct of Life," delivered in Pittsburg (1851-03).