An excerpt from the book Denial of Death:
Most of us, by the time we leave childhood, have repressed our vision of the primary miraculousness of creation. We have closed it off, changed it, and no longer perceive the world as it is to raw experience. The great boon of repression is that it makes it possible to live decisively in an overwhelmingly miraculous and incomprehensible world, a world so full of beauty, majesty, and terror that if animals perceived it all they would be paralyzed to act. But nature has protected the lower animals by endowing them with instincts. It is very simple: Animals are not moved by what they cannot react to. They live in a tiny world, a sliver of reality, one neuro-chemical program that keeps them walking behind their noses and shuts everything else out. But look at man, the impossible creature. Here nature seems to have thrown caution to the winds along with the programmed instincts. She created an animal who has no defense against full perception of the external world, an animal completely open to experience. Not only in front of his nose, in his ‘umwelt,’ but in many other ‘umweltsen.’ He can relate not only to animals in his own species, but in some ways to all other species. He can contemplate not only what is edible for him, but everything that grows. He not only lives in this moment, but expands his inner self to yesterday, his curiosity to centuries ago, his fears to five billion years from now when the sun will cool, his hopes to an eternity from now. He lives not only on a tiny territory, nor even on an entire planet, but in a galaxy, in a universe, and in dimensions beyond visible universes. It is appalling, the burden than man bears. He doesn’t know who he is, why he was born, what he is doing on the planet, what he is supposed to do, what he can expect. His own existence is incomprehensible to him, a miracle just like the rest of creation, closer to him but all the more strange. Each thing is a problem. Man had to invent and create out of himself the limitations of perception and the equanimity to live on this planet. And so the core of psychodynamics, the formation of human character, is a study in human self-limitation and in the terrifying costs of that limitation.