The rigid electron is in my view a monster in relation to Maxwell's equations, whose innermost harmony is the principle of relativity. - Hermann Minkowski

[Zurich,] where the students, even the most capable among them, ... are accustomed to get everything spoon-fed.

Oh, that Einstein, always cutting lectures... I really would not believe him capable of it.

By laying down the relativity postulate from the outset, sufficient means have been created for deducing henceforth the complete series of Laws of Mechanics from the principle of conservation of energy (and statements concerning the form of the energy) alone.