The way in which men produce their means of subsistence depends first of all on the nature of the actual means they find in existence and have to reproduce.

我们只有生活一次，所以要活得充实而真实。

The whole conviction of my life now rests upon the belief that loneliness, far from being a rare and curious phenomenon, peculiar to myself and to a few other solitary men, is the central and inevitable fact of human existence.

"The truth is rarely pure and never simple."