The true teacher defends his pupils against his own personal influence.
Sustainability must be profitable, or it won't be sustainable.
道德的營養(yǎng)不良和精神的中毒對人的心靈的危害，正如身體的營養(yǎng)不良對于身體健康的危害一樣。
好奇心是每一次重大科學(xué)進步背后的驅(qū)動力。
數(shù)學(xué)是理性的音樂。
The future is not a result of choices among alternative paths offered by the present, but a place that is created—created first in the mind and will, created next in activity.