Music is a moral law. It gives a soul to the universe, wings to the minds, flight to the imagination, a charm to sadness, gaiety and life to everything. It is the essence of order, and leads to all that is good, just, and beautiful.

Persistence is key in mathematical research; many great results come from long struggles.

最古老、最简短的词语——'是'和'否'——是需要最多思考的。