交换、交易和互换的倾向普遍存在于所有人之中，而在其他动物种族中找不到。

"A book is a dream that you hold in your hand."

Celebrate your successes. Find some humor in your failures.

Every artist dips his brush in his own soul, and paints his own nature into his pictures.

我解决的每一个问题都成为后来解决其他问题的规则。