From Moonshine Beyond the Monster:
Much as beavers, who as a species hate the sound of running water, plaster a creek with mud and sticks until alas that cursed tinkle stops, so do category theorists derive elaborate and obscure definitions in an attempt to capture a concept that to most of us seemed perfectly clear before they got to it. But at least sometimes this works admirably …
I have to admit that category theory was the one topic in graduate school that I never grokked. I couldn’t see the point to it. But we never went into it very deeply in any of my courses.