悲觀者抱怨風向，樂觀者期待風向改變，務實的人調整船帆。 The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.

悲觀者抱怨風向，樂觀者期待風向改變，務實的人調整船帆。 The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
— 威廉．亞瑟．沃德， 美國作家