It's survival of the fittest.
Life is not about waiting for the storm to pass, but learning to dance in the rain.
Change the way you look at things and the things you look at change.
I went to the woods because I wanted to live deliberately. I wanted to live deep and suck out all the marrow of life. To put to rout all that was not life. And not, when I had come to die, discover that I had not lived.
合理的战略始于树立正确的目标。