A mathematician is a maker of patterns, like a painter or a poet.
I was not born blind, I became blind at the age of 12. So I have seen the world and I know what things look like. When I sing about love and pain, joy and sadness, I know what I'm singing about.
The past is a foreign country; they do things differently there.
尽可能广泛地涉猎各门学问,并且尽可能深入地择一钻研。