Since the mathematicians have invaded the theory of relativity, I do not understand it myself anymore.

There have been only three epochmaking mathematicians: Archimedes, Newton, and Eisenstein.
ferdinand eisensteinTo illustrate to what extent Hardy and Littlewood in the course of the years came to be considered as the leaders of recent English mathematical research, I may report what an excellent colleague once jokingly said: 'Nowadays, there are only three really great English mathematicians: Hardy, Littlewood, and HardyLittlewood.'
g. h. hardy... mathematicians progress only by doubt, through humble and constant attempts to impinge on the immense domain of the unknown.
The mathematicians know a great deal about very little and the physicists very little about a great deal.
stanislaw ulamFirst rate mathematicians choose first rate people, but second rate mathematicians choose third rate people.
andré weilScientific discovery consists in the interpretation for our own convenience of a system of existence which has been made with no eye to our convenience at all.One of the chief duties of a mathematician in acting as an advisor to scientists is to discourage them from expecting too much of mathematicians.
Norbert WienerIt is almost as hard to define mathematics as it is to define economics, and one is tempted to fall back on the famous old definition attributed to Jacob Viner, “Economics is what economists do,” and say that mathematics is what mathematicians do. A large part of mathematics deals with the formal relations of quantities or numbers.
kenneth bouldingBiographical history, as taught in our public schools, is still largely a history of boneheads: ridiculous kings and queens, paranoid political leaders, compulsive voyagers, ignorant generals the flotsam and jetsam of historical currents. The men who radically altered history, the great scientists and mathematicians, are seldom mentioned, if at all.
martin gardnerShould I not be proud, when for twenty years I have had to admit to myself that the great Newton and all the mathematicians and noble calculators along with him were involved in a decisive error with respect to the doctrine of color, and that I among millions was the only one who knew what was right in this great subject of nature?
The whole thing that makes a mathematician’s life worthwhile is that he gets the grudging admiration of three or four colleagues.
donald knuthCourage is not a quality one normally associates with mathematicians. Yet it should apply to people who work in their attics in secret for seven years without cease on a problem that has eluded the greatest mathematical minds since first proposed in 1637.
charles krauthammerAll musicians are subconsciously mathematicians.
thelonious monkInstruction tables will have to be made up by mathematicians with computing experience and perhaps a certain puzzlesolving ability. There need be no real danger of it ever becoming a drudge, for any processes that are quite mechanical may be turned over to the machine itself.
alan turingA great deal of study has been directed to denning 'best decisions,' particularly since the pioneering work of mathematical statisticians (such as Wald), of mathematicians (such as von Neumann), of economists (such as Arrow )... The main effect of this development on the practice of OR has been the growing realization that there are decision objectives other than maximizing expected return and minimizing maximum loss. That is, in many practical situations there are criteria of optimality that are more appropriate than these two mentioned.
I have expos'd myself to the enmity of all metaphysicians, logicians, mathematicians, and even theologians; and can I wonder at the insults I must suffer?
Direct application of the theory of games to the solution of real problems has been rare, and its chief uses have been to offer some insight and understanding into the problems of competition (without actually solving them), and to provide mathematicians with new fields to conquer. Many important real problems involve more than two opponents, are not zerosum, and exceed the bounds of the most developed versions of game theory.
[His work is addressed]... not to the learned and experienced mathematicians who are already, or should be, better acquainted with them... [and most of whom] have studied mechanics more as a subject of curiosity and a hobby, than with any view of service to the public. The people we had in mind were rather the mechanic, handicraftsman and the like, who, without education or knowledge of foreign languages have no access to many sources of information...
Math is perfect (in principle), but mathematicians are not (because they are humans), hence the mathematics that (human) mathematicians do is influenced by the weltanschauung of the people around them.
One does not read in the Gospel that the Lord said: "I will send you the Paraclete who will teach you about the course of the sun and moon ." For He willed to make them Christians, not mathematicians.
Trying to solve realworld problems, researchers often discover that the tools they need were developed years, decades or even centuries earlier by mathematicians with no prospect of, or care for, applicability.
mathematicians seem to have no difficulty in creating new concepts faster than the old ones become well understood.
mathematicians believed that prediction was just a function of keeping track of things. If you knew enough, you could predict anything… Chaos theory throws it right out the window because in fact there are great categories of phenomena that are inherently unpredictable.