数学的本质在于它的自由。
The only limits you have are the ones you set for yourself.
To do great things is difficult,but to command great things is more difficult.
创造财富并没有错,错的是为了钱本身而爱钱。
作家的秘密不是灵感——因为灵感从何而来永远是个谜——而是固执和耐力。
Don’t ever respond to a solicitation or a proposal on the phone. The urgency is a disguise.