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No man really knows about other human beings. The best he can do is to suppose that they are like himself.
If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.
The essence of science is not in the knowing but in the seeking.
The essence of mathematics is not to make simple things complicated, but to make complicated things simple.
The purpose of art is to make the soul visible.
"The truth is rarely pure and never simple."