Success is not final, failure is not fatal: it is the courage to continue that counts.

科学通过不断质疑和完善我们的理解而进步。

Retire into yourself and ask yourself this question: Must I write？ If the answer is yes， then you must keep writing.

I do not know what I may appear to the world， but to myself I seem to have been only like a boy playing on the sea-shore， and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary， whilst the great ocean of truth lay all undiscovered before me.

Good looks are a snare that every sensible man would like to be caught in.

Art is not what you see, but what you make others see.

The meaning of life lies not in the answers, but in the questions.