“The hours pass the more quickly the more pleasantly they are spent, and the more slowly the more painfully they are spent, since pain not pleasure, is the positive thing, whose presence makes itself felt. In just the same way we become conscious of time when we are bored, not when we are amused. Both cases prove that our existence is happiest when we perceive it least; from this it follows that it would be better not to have it.”

– Arthur Schopenhauer, On the Vanity and Suffering of Life