Humor is the only test of gravity, and gravity of humor; for a subject which will not bear raillery is suspici... — Aristotle
Humor is the only test of gravity, and gravity of humor; for a subject which will not bear raillery is suspicious, and a jest which will not bear serious examination is false wit.
Author: Aristotle
Insight: Your best ideas should survive a joke about them—if they collapse when someone laughs, they probably weren't solid to begin with. The same goes for your humor; if you can't defend why something's funny, it's just noise. Strength and lightness aren't opposites.