To feel much for others and little for ourselves； to restrain our selfishness and exercise our benevolent affections， constitute the perfection of human nature.

数学的真正力量不在于它的复杂性，而在于它的简洁和优雅。

傲慢的人突然显达，上天也会惩罚他；疏漏放纵的人，努力求进取，上天也会宽容他的行为。