不登高山，不知天之高也；不临深溪，不知地之厚也。
不登上高山，就不知道天是多么高远；不亲临深溪，就不知道地是多么深厚。
我无话可说，而我正在说它。
释义：如果田地没成熟就收获，还不如不种；如果养育的孩子不学好，还不如没有。
The time which we have at our disposal every day is elastic; the passions that we feel expand it, those that we inspire contract it.
In computer science, we often find that the simplest solutions are the most elegant.
The purpose of mental activity is to guide action.
