"The beauty of science is that it is constantly evolving and there is always something new to discover."

The knowledge that you have emerged wiser and stronger from setbacks means that you are, ever after, secure in your ability to survive. You will never truly know yourself, or the strength of your relationships, until both have been tested by adversity. Such knowledge is a true gift, for all that it is painfully won, and it has been worth more than any qualification I ever earned.

我必须研究政治和战争，以便我的儿子们可以自由地研究数学和哲学。