Whilst Bentham maintains that pleasures and pains are “addible” so that in any situa - tion the net result is a quantum of either pleasure or pain, Plato argues that although they “both admit of more and less” neither can be subtracted from the other because “the negation of pain will not be the same with pleasure” (Philebus 41, 43).    From Wordnik.com.  [Dictionary of the History of Ideas] Reference

For, even in space and duration, when the mind pursues the idea of infinity, it there makes use of the ideas and repetitions of numbers, as of millions and millions of miles, or years, which are so many distinct ideas, — kept best by number from running into a confused heap, wherein the mind loses itself; and when it has added together as many millions, &c., as it pleases, of known lengths of space or duration, the clearest idea it can get of infinity, is the confused incomprehensible remainder of endless addible numbers, which affords no prospect of stop or boundary.    From Wordnik.com.  [An Essay Concerning Human Understanding] Reference