Just as the largest library, badly arranged, is not so useful as a very moderate one that is well arranged, so the greatest amount of knowledge, if not elaborated by our own thoughts, is worth much less than a far smaller volume that has been abundantly and repeatedly thought over.

Optimism is not only a false but also a pernicious doctrine, for it presents life as a desirable state and man's happiness as its aim and object. Starting from this, everyone then believes he has the most legitimate claim to happiness and enjoyment. If, as usually happens, these do not fall to his lot, he believes that he suffers an injustice, in fact that he misses the whole point of his existence.

Mostly the loss teaches us only about the value of things.

There are two things which make it impossible to believe that this world is the successful work of an all-wise, all-good, and at the same time, all-powerful being; firstly, the misery which abounds in it everywhere; and secondly, the obvious imperfection of its highest product, man, who is a burlesque of what he should be.

If two men who were friends in their youth meet again when they are old, after being separated for a life-time, the chief feeling they will have at the sight of each other will be one of complete disappointment at life as a whole; because their thoughts will be carried back to that earlier time when life seemed so fair as it lay spread out before them in the rosy light of dawn, promised so much — and then performed so little.

A word too much always defeats its purpose.

The tallest oak tree once was an acorn that any pig could have swallowed.