Man's main task in life is to give birth to himself, to become what he potentially is. The most important product of his effort is his own personality.

实现明天理想的唯一限制是我们今天的疑虑。

化学的语言是通用的，超越了国界和文化。

人类不是存在物的主人，而是存在的牧羊人。