In a state, one man's liberty ends where another's begins.

The true cost of inequality is the potential that goes unrealized.

思想即是感恩。

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

The world is a beautiful book, but of little use to him who cannot read it.

诚信是任何持久企业的基础。