It is not knowledge, but the act of learning, not possession but the act of getting there, which grants the greatest enjoyment.
Theory attracts practice as the magnet attracts iron.
Mathematics is the queen of sciences and number theory is the queen of mathematics. She often condescends to render service to astronomy and other natural sciences, but in all relations she is entitled to the first rank.
You know that I write slowly. This is chiefly because I am never satisfied until I have said as much as possible in a few words, and writing briefly takes far more time than writing at length.
You have no idea, how much poetry there is in the calculation of a table of logarithms!
If others would but reflect on mathematical truths as deeply and as continuously as I have, they would make my discoveries.
Life stands before me like an eternal spring with new and brilliant clothes.
I have had my results for a long time: but I do not yet know how I am to arrive at them.
It is not knowledge, but the act of learning, not possession but the act of getting there, which grants the greatest enjoyment. When I have clarified and exhausted a subject, then I turn away from it, in order to go into darkness again; the never-satisfied man is so strange if he has completed a structure, then it is not in order to dwell in it peacefully,but in order to begin another. I imagine the world conqueror must feel thus, who, after one kingdom is scarcely conquered, stretches out his arms for others.
The Infinite is only a manner of speaking.
There have been only three epoch-making mathematicians, Archimedes, Newton, and Eisenstein.
Mathematicians stand on each other's shoulders.
The enchanting charms of this sublime science reveal only to those who have the courage to go deeply into it.
We must admit with humility that, while number is purely a product of our minds, space has a reality outside our minds, so that we cannot completely prescribe its properties a priori.
Mathematics is the queen of science, and arithmetic the queen of mathematics.
No contradictions will arise as long as Finite Man does not mistake the infinite for something fixed, as long as he is not led by an acquired habit of mind to regard the infinite as something bounded.
Mathematics is concerned only with the enumeration and comparison of relations.
There are problems to whose solution I would attach an infinitely greater importance than to those of mathematics, for example touching ethics, or our relation to God, or concerning our destiny and our future; but their solution lies wholly beyond us and completely outside the province of science.
I have a true aversion to teaching. The perennial business of a professor of mathematics is only to teach the ABC of his science; most of the few pupils who go a step further, and usually to keep the metaphor, remain in the process of gathering information, become only Halbwisser [one who has superficial knowledge of the subject], for the rarer talents do not want to have themselves educated by lecture courses, but train themselves. And with this thankless work the professor loses his precious time.
When a philosopher says something that is true then it is trivial. When he says something that is not trivial then it is false.
I mean the word proof not in the sense of the lawyers, who set two half proofs equal to a whole one, but in the sense of a mathematician, where half proof = 0, and it is demanded for proof that every doubt becomes impossible.
When I have clarified and exhausted a subject, then I turn away from it, in order to go into darkness again.
Does the pursuit of truth give you as much pleasure as before? Surely it is not the knowing but the learning, not the possessing but the acquiring, not the being-there but the getting there that afford the greatest satisfaction. If I have exhausted something, I leave it in order to go again into the dark. Thus is that insatiable man so strange: when he has completed a structure it is not in order to dwell in it comfortably, but to start another.
In my opinion instruction is very purposeless for such individuals who do no want merely to collect a mass of knowledge, but are mainly interested in exercising (training) their own powers. One doesn't need to grasp such a one by the hand and lead him to the goal, but only from time to time give him suggestions, in order that he may reach it himself in the shortest way.
The total number of Dirichlet's publications is not large: jewels are not weighed on a grocery scale.
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