When you do something best in life, you don’t really want to give that up – and for me it’s tennis.

自由的代价是永恒的警惕。

苦难是最好的老师，教导我们了解自我的内心，虽然受到磨练与心碎，但我相信会让自己变成更好状态。

In the examination of the parts of animals, I have diligently endeavored to arrive at the truth.

解释：凡要谋划一件事，一定要预见到成功的把握，然后才可以去做。

没有道德或不道德的书，只有写得好或写得差的书。