„The predecessors of Newton and Leibnitz knew perfectly well how to determine tangents and areas, but they had to approach each problem from first principles. The great contribution of Newton and Leibnitz was precisely to make the procedures for finding tangents, areas, etc. into a calculus, that is, a systematic way of calculating—a collection of algorithms, to use the currently fashionable word.“
— Ralph P. Boas Jr.
[Calculus as an Experimental Science, 78, 6, 1971, 664–667, The American Mathematical Monthly, 10.2307/2316582]