I can't tell you how many times I've spent hours tracking down the source of a quote only to find that either the "quote" is really just a paraphrase of someone

I can't tell you how many times I've spent hours tracking down the source of a quote only to find that either the "quote" is really just a paraphrase of someone's work that someone else mistook for a quote or that the "quote" from source A is really in source B but is actually source B quoting source C