Abstraction is the key to mathematics.
男孩需要被拥抱和呵护,不仅仅是在他们小的时候,而是贯穿他们的一生。
韧性是通过克服挑战建立起来的。
"There is only one real sin, and that is to persuade oneself that the second-best is anything but the second-best."