The only way to learn mathematics is to do mathematics.

We are all haunted by the ghosts of our own making.

释义：荣华富贵不过是短暂的梦境，如同九月的霜一样容易消逝。老病死生是每个人都要面对的，无法由他人替代，人生的酸甜苦辣只能自己承担。

The writer’s job is to write with rigor, with honesty, to the very end of his strength.