Don't be afraid to fail. Be afraid not to try.
不要害怕失败，要害怕不去尝试。
The hardest single part of building a software system is deciding precisely what to build.
The simplest materials can contain the most complex meanings.
晏子春秋
在数学中，提出问题的艺术必须比解决问题更有价值。
Farmers are the main body of agriculture, we must make farmers beneficiaries of modern agriculture.
Success is not the key to happiness. Happiness is the key to success.