Almost every year I find some excuse to run one of my favorite quotes ever from a math volume, a bit of linguistics and recursive philosophy from provocateur David Berlinski in "The King of Infinite Space" (about Euclid). Berlinski is nothing if not an artiste of wordplay, and recently finishing "Shape" by Jordan Ellenberg's (no slouch at wordsmithing himself; though a bit more fun), simply reminded me of it once again:
"Like any other mathematician, Euclid took a good deal for granted that he never noticed. In order to say anything at all, we must suppose the world stable enough so that some things stay the same, even as other things change. This idea of general stability is self-referential. In order to express what it says, one must assume what it means.