The secret of getting ahead is getting started.
"The greatest thing you'll ever learn is just to love and be loved in return."
I don't sing because I'm happy. I'm happy because I sing.
解释：向外物游览就要要求外物的完备，向自己内心求取，则能充实完善自身。
The use of a program to prove the 4-color theorem will not change mathematics - it merely demonstrates that the theorem, a challenge for a century, is a finite problem.
【译文】 孔子说：“三军可以剥夺主帅，匹夫不可剥夺志向。”
I must study politics and war that my sons may have liberty to study mathematics and philosophy.