To Thales the primary question was not what do we know, but how do we know it.
A human being is a part of the whole called by us universe; a part limited in time and space. He experiences himself, his thoughts, and his feelings as something separate from the rest - a kind of optical delusion of consciousness.
I read in the proof sheets of Hardy on Ramanujan: "As someone said, each of the positive integers was one of his personal friends." My reaction was, "I wonder who said that; I wish I had." In the next proof-sheets I read (what now stands), "It was Littlewood who said..."
No human investigation can be called real science if it cannot be demonstrated mathematically.
His epitaph: Who, by vigor of mind almost divine, the motions and figures of the planets, the paths of comets, and the tides of the seas first demonstrated.
Mathematics compares the most diverse phenomena and discovers the secret analogies that unite them.
We often hear that mathematics consists mainly of "proving theorems." Is a writer's job mainly that of "writing sentences?"
The study of mathematics is apt to commence in disappointment... We are told that by its aid the stars are weighed and the billions of molecules in a drop of water are counted. Yet, like the ghost of Hamlet's father, this great science eludes the efforts of our mental weapons to grasp it.
One can't believe impossible things.
He is unworthy of the name of man who is ignorant of the fact that the diagonal of a square is incommensurable with its side.
Mathematics is the science which draws necessary conclusions.
Many who have never had an opportunity of knowing any more about mathematics confound it with arithmetic, and consider it an arid science. In reality, however, it is a science which requires a great amount of imagination.
Poets do not go mad, but chess players do.
I am acutely aware of the fact that the marriage between mathematics and physics, which was so enormously fruitful in past centuries, has recently ended in divorce.
One of the big misapprehensions about mathematics that we perpetrate in our classrooms is that the teacher always seems to know the answer to any problem that is discussed.
Pure mathematics, may it never be of any use to anyone.
You know we all became mathematicians for the same reason: we were lazy.
Mathematics seems to endow one with something like a new sense.
[Mathematics] is an independent world created out of pure intelligence.
Logic is invincible, because in order to combat logic it is necessary to use logic.
It is not certain that everything is uncertain.
The highest form of pure thought is in mathematics.
It is not the job of mathematicians... to do correct arithmetical operations. It is the job of bank accountants.
Logic is the hygiene the mathematician practices to keep his ideas healthy and strong.
One of the big misapprehensions about mathematics that we perpetrate in our classrooms is that the teacher always seems to know the answer to any problem that is discussed. This gives students the idea that there is a book somewhere with all the right answers to all of the interesting questions, and that teachers know those answers. And if one could get hold of the book, one would have everything settled. That's so unlike the true nature of mathematics.
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