Don't be happy if you win; Don't be complacent if you lose; He who has thunder in his chest and a face like a lake can worship the general! From Sun Tzu's Art of War, quoted in many places.

The original text is: Shun, not false happiness; Inverse, don't be embarrassed; Ann, not extravagant; Danger, not fear; He who has thunder on his chest and a face like a lake can worship the general.