Ambrose Bierce quote

I heard this quote recently in a movie, the name of which I can't remember for the life of me, but I wrote it down and then wanted to look for the author. I googled the quote and found that Ambrose Bierce, a journalist in the 1800s said it, "In each human heart are a tiger, a pig, an ass, and a nightingale. Diversity of character is due to their unequal activity."
-Ambrose Bierce