实现明天理想的唯一限制是我们今天的疑虑。

The human being cannot live in a condition of emptiness for very long: if he is not growing toward something, he does not merely stagnate; the pent-up potentialities turn into morbidity and despair, and eventually into destructive activities.

学习数学的唯一方法就是做数学。

只有服从自然，才能控制自然。

要发展业务，首先要培养人才。