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

Never be afraid of the moments-thus sings the voice of the everlasting .

我是一个战士，我喜欢挑战。

"Experience is simply the name we give our mistakes."

Only by continuous learning can we make continuous progress.

普通人不知道如何度过自己的一生，却还想要另一个永恒的生命。