And perhaps there is none, no morrow anymore, for one who has waited so long for it in vain. And perhaps he has come to that stage of his instant when to live is to wander the last of the living in the depths of an instant without bounds, where the light never changes and the wrecks all look alike. Bluer scarcely than white of egg the eyes stare into the space before them, namely the fullness of the great deep and unchanging calm. But at long intervals they close, with the gentle suddenness of flesh that tightens, often without anger, and closes on itself.

Something as superfluous as "play" is also an essential feature of our consciousness. If you ask children why they like to play, they will say, "Because it's fun." But that invites the next question: What is fun? Actually, when children play, they are often trying to reenact complex human interactions in simplified form. Human society is extremely sophisticated, much too involved for the developing brains of young children, so children run simplified simulations of adult society, playing games such as doctor, cops and robber, and school. Each game is a model that allows children to experiment with a small segment of adult behavior and then run simulations into the future. (Similarly, when adults engage in play, such as a game of poker, the brain constantly creates a model of what cards the various players possess, and then projects that model into the future, using previous data about people's personality, ability to bluff, etc. The key to games like chess, cards, and gambling is the ability to simulate the future. Animals, which live largely in the present, are not as good at games as humans are, especially if they involve planning. Infant mammals do engage in a form of play, but this is more for exercise, testing one another, practicing future battles, and establishing the coming social pecking order rather than simulating the future.)

No child should ever be too sad to play.

The subsistence mentality of a person is a prison in which his personal joy is detained. If you want to live in joy, you don't live for yourself alone. Live for others too!

The sage is sick of being sick (Tao Te Ching)

I must be happy, he said, it is less pleasant than I should have thought.