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“You can never follow exactly what someone else did and expect it to work. You have to find your own route, leaning heavily on your confidence, trial and error, patience and persistence. It’s about 90 percent hard work and 10 percent timing and luck.”

“You can never get enough generality. The more general solution the better. The solution to existence is the most general solution of all, the solution least infected by particularity. That is its defining quality. The entire way of thinking mathematically – in terms of simplicity, generality, tautology, elegance, beauty, stability, the eternal, the necessary, coherence, the analytic, the a priori – is totally different from the way a scientist thinks, which is always mired in particularity, inelegance, ugliness, the temporal, the contingent, the ad hoc, the arbitrary, the heuristic, the speculative; in Feynman’s crude guessing game.”

“You can never get to a person's mind. You cannot know the different deeds and missions of happiness; you can't tell a screm of pleasure from one of pain. Sometimes, we can barely read pain. Neither a barometer nor a guide, pain can mislead us. Even in the body, the laws of chain reactions can be false. This is why people always want a second opinion.”