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Youth is not a time of life; it is a state of mind; it is not a matter of rosy cheeks, red lips and supple knees; it is a matter of the will, a quality of the imagination, a vigor of the emotions; it is the freshness of the deep springs of life.

Mathematics is not a spectator sport; to understand it, one must engage with it actively.

美貌、青春、財富、甚至愛情本身，都不能讓深得上帝恩寵的人免于焦慮和痛苦，遠離哀愁，也無法讓他們避免失去自己最愛的東西。因為，一生中，有些雨必然得下，一些日子必然會黑暗、哀傷、凄涼。

"To thine own self be true."

我不讓消極情緒把我打倒。我會超越它。