有时候生活中最难的事情是知道该跨过哪座桥,该烧掉哪座桥。
可持续性不是一种趋势;这是我们对后代的责任。
真相是,我们在这个世界上都是孤独的。
I have been a selfish being all my life, in practice, though not in principle.
A good mathematician is one who can see analogies between theorems; a great mathematician is one who can see analogies between analogies.