Deep Learning, circa 1st century BC

[timelets]

Of these methods of divining it behoves us, I think, to examine the results rather than the causes. For there is a certain natural power, which now, through long-continued observation of signs and now, through some divine excitement and inspiration, makes prophetic announcement of the future.

7 "Therefore let Carneades cease to press the question, which Panaetius also used to urge, whether Jove had ordered the crow to croak on the left side and the raven on the right. Such signs as these have been observed for an unlimited time, and the results have been checked and recorded. Moreover, there is nothing which length of time cannot accomplish and attain when aided by memory to receive and records to preserve. We may wonder at the variety of herbs that have been observed by physicians, of roots that are good for the bites of wild beasts, for eye affections, and for wounds, and though reason has never explained their force and nature, yet through their usefulness you have won approval for the medical art and for their discoverer.
...
I am content with my knowledge that it does, although I may not know why.
...

--- Cicero, On Divination, Book 1:6-7,9.


did the fact that so many illustrious captains and kings suffered shipwreck deprive navigation of its right to be called an art? And is military science of no effect because a general of the highest renown recently lost his army and took to flight?

ibid, 1:14