债务要么产生于契约，要么产生于侵权行为。

为明天做的最好准备就是今天做到最好。

The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.

Learn how to take a 20-minute power nap without embarrassment.

性能的关键在于优雅，而不是大量的特殊情况。

"We are all fools in love."

I have always believed that if you want to achieve anything in life, you have to work for it.