居必择乡，游必就士。
出自先秦《荀子·劝学》。定居一定要选择适当的邻里，交游一定要接近贤士。说明要加强道德修养，就应该注意周围环境。
The passions that incline men to peace are fear of death, desire of such things as are necessary to commodious living, and a hope by their industry to obtain them.
I've learned that it's okay to be vulnerable.
重构程序的最好方法是重构它。
数学思想的真正考验是它能否激发进一步的思考。
Quality means doing it right when no one is looking.