The best teacher is the one who suggests rather than dogmatizes, and inspires his listener with the wish to teach himself.
The darkest nights produce the brightest stars.
地理学是关于地方的科学,而不是关于人的科学。
今天很好,今天很有趣。明天又是新的一天。
The beauty of mathematics lies in its ability to reveal hidden symmetries and truths.