Introspection is the only method by which the mind can be directly observed.
The quest for certainty blocks the search for meaning. Uncertainty is the very condition to impel man to unfold his powers.
The best way to find yourself is to lose yourself in the service of others.
数学的研究就像空气或重力——它无处不在,你看不到它,但你知道它在那里。
Words are like shadows, and shadows are like words: they say nothing, they only repeat what we want to hear.