There is much pleasure to be gained from useless knowledge.
Reason is a harmonising, controlling force rather than a creative one.
Mathematics takes us still further from what is human into the region of absolute necessity, to which not only the actual world, but ever possible world, must conform.
If it is the devil that tempts the young to enjoy themselves, is it not the same personage that persuades the old to condemn their enjoyment? And is not condemnation perhaps merely a form of excitement appropriate to old age?
When admitting that nothing is certain, one must also, I think, admit that some things are much more nearly certain than others.
I went to Russia a Communist; but contact with those who have no doubts has intensified a thousandfold my own doubts, not as to Communism in itself, but as to the wisdom of holding a creed so firmly that for its sake men are willing to inflict widespread misery.