I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection.  

Matter is divisible ad infinitum, while form is indivisible.

经验只是我们给错误起的名字。

每一部小说都是举向社会的一面镜子，映照出它的美与缺陷。

Take long walks in stormy weather or through deep snows in the fields and woods, if you would keep your spirits up. Deal with brute nature. Be cold and hungry and weary.

The true measure of success isn't just profitability, but how we achieve it.