——〈在香港大学的演说〉（又名〈革命思想之产生〉），1923年2月19日
The real competition is never rivals, but users' old habits.
Never underestimate the power of small, consistent steps toward a larger goal.
The man who moves a mountain begins by carrying away small stones.
改变世界的唯一方法是改变自己。
应对不自由世界的唯一方法是变得如此绝对自由，以至于你的存在本身就是一种反叛。
Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.
可持续性不是一种趋势，而是我们对地球和后代的责任。
The test of a psychological theory is its applicability to life.
The best films are those that leave you with more questions than answers.
我认为，为了看学生是否符合教师设定的某些标准而测试其成绩，与治疗对有意义学习的启示直接相悖。
It is far more difficult to murder a phantom than a reality.
Music is a power that can heal the soul.