happiness requires struggle. The positive is the side effect of handling the negative. You can only avoid negative experiences for so long before they come roaring back to life.
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Some things, like the orbits of the planets, can be calculated far into the future. But that's atypical. In most contexts, there is a limit. Even the most fine-grained computation can only forecast British weather a few days ahead. There are limits to what can ever be learned about the future, however powerful computers become.