证明的严谨性将数学与所有其他科学区分开来。
The best time to plant a tree was 20 years ago; the second-best time is now.
翻译:过去善于打仗的将领,首先做到自己不被敌人战胜,再等待时机战胜敌人。不被敌人战胜取决于自己做好准备、不犯错,是否能战胜敌人取决于敌人是否犯错。
Love yourself first, because that's where all the magic begins.
The land is the real client, not the person who pays the fee.