生活是由故事组成的,我们每个人都是自己故事的作者。
A vida é feita de histórias, e cada um de nós é o autor da sua própria história.
Don't be defined by what you didn't know or didn't do.
A scientific man ought to have no wishes, no affections, a mere heart of stone.  
The definition of a good mathematical problem is the mathematics it generates rather than the problem itself.