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有一個快樂的境況出現，但就有一個不快樂的境況相對立；有一處優美的風景出現，但就立即有一處不優美的風景相抵銷。

The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

要成功，僅靠計劃是不夠的。還必須即興發揮。

The essence of mathematics is not to make simple things complicated, but to make complicated things simple.

市場在短期內是投票機，在長期內是稱重機。