A cat, when it walks—did you ever see a cat making an aesthetic mistake. Did you ever see a badly formed cloud? Were the stars ever mis-arranged? When you watch the foam breaking on the seashore, did it ever make a bad pattern? Never. And yet we think in what we do, we make mistakes. And we’re worried about that. So there came this point in human evolution when we lost our innocence. When we lost this thing that the cats and the flowers have, and had to think about it, and had to purposely arrange and discipline and push our lives around in accordance with foresight and words and systems of symbols, accountancy, calculation and so on, and then we worry. Once you start thinking about things, you worry as to if you thought enough. Did you really take all the details into consideration? Was every fact properly reviewed? And by Jove, the more you think about it, the more you realize you really couldn’t take everything into consideration, because all the variables in every decision are incalculable, so you get anxiety. And this, though, also, is the price you pay for knowing that you know. For being able to think about thinking, being able to feel about feeling. And so you’re in this funny position.
~Alan Watts (The Nature of Consciousness)