If you're not failing occasionally, you're not pushing hard enough.
我梦到了我的儿子会成长为一个好人,一个拥有自由意志的人;我梦到了有一天,你会回到我们童年玩耍的这片土地,故地重游;我梦到了鲜花再次在街道上盛开……天空满是色彩斑斓的风筝!
A good mathematician is always ready to generalize.