凡学之不勤、必其志未笃也。
释义：求学之人若不勤奋，必然是其志向不坚定。
Pros are just amateurs who know how to gracefully recover from their mistakes.
The most important part of teaching is to teach what it is to know.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.