没有牺牲，就没有自由。
Without sacrifice, there is no freedom.
The value of psychology is in its power to explain life.
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
"We are all the heroes of our own stories."
Quality is remembered long after price is forgotten.
人心容易偏离正道，道心微妙难明，只有精研专一，才能持守中道。