Mathematics is not a spectator sport.
对人类同胞最大的罪恶不是憎恨,而是冷漠:那是不人道的本质。
The greatest happiness for the laborer consists in having an abundant supply of the necessaries of life.
你越是处于心流状态,你就越能发展技能,取得的成就越多,对自己的感觉就越好。