To realize one’s nature perfectly---that is what each of us is here for.
I don't think you can ever do your best. Doing your best is a process of trying to do your best.
这就好像自己赤裸着身体却指责别人掀起衣服不礼貌一样。 
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。
The future city will be a ruin from the beginning.
婚姻生活是否幸福,完全是个机会问题。