——《在石家莊國民黨交通部歡迎會的演說》（1912年9月21日）
言語有治愈傷口的力量，也有加深傷口的可能；作家必須明智地選擇。
The essence of computational complexity is to understand the limits of what can be computed efficiently.
Thought is the servant of action, and action is the servant of survival.
The first duty of a man is to think for himself.