Mathematics is the art of giving the same name to different things.
All of mathematics is a tale about groups.
When the physicists ask us for the solution of a problem, it is not drudgery that they impose on us, on the contrary, it is us who owe them thanks.
We also know how cruel the truth often is, and we wonder whether delusion is not more consoling.
Need we add that mathematicians themselves are not infallible?
Einstein does not remain attached to the classical principles, and when presented with a problem in physics he quickly envisages all of its possibilities. This leads immediately in his mind to the prediction of new phenomena which may one day be verified by experiment.