All art is quite useless.
Science can never grapple with the irrational. That is why it has no future before it, in this world.
A truth ceases to be true when more than one person believes in it.
Pleasure is the only thing one should live for, nothing ages like happiness.
But then one regrets the loss even of one's worst habits. Perhaps one regrets them the most. They are such an essential part of one's personality.
Whenever people agree with me I always feel I must be wrong.