When you think about the scope of human history, and how little we know, it's sad to think of all the lost work. We only know things going back a few thousand years, but men who have our same cognition have been around for far longer. Plato spoke of a golden age, now long lost, where the flaura and fuana were so plentiful that men didn't need to work. Atlantis is mentioned, stories of a distant time, with men who may…
That's an example of the belief that all things were known in a golden age, and that the process of discovery is actually rediscovery of the knowledge of the elders. Common in a lot of pre-modern societies that had ancestor-worship. In old B.C.E. pre-imperial Chinese philosophy, before deductive reasoning had been formalized/discovered, one of the basic tests of whether a thing was true was "conformity to the teaching and practice of the ancient sage kings." Which meant that you had to cite a mention in works about the ancients of the practice or belief that you were recommending, or grounds for a reasonable belief that they practiced it.
It's the opposite of Whig history.