Vous avez cherché: lesson learned from experience (Anglais - Latin)

lesson learned from experience
lesson learned from a bad experience

lesson learned
lectio magistralis

no regrets in life just lesson learned
non paenitet iustus discitur

where he learned from the inhabitants of
ubi ex incolis cognovit bovines esse in ea regione

just lessons learned
non paenitet in vita sicut lectiones didicit

now, as much as the plan, as much as the gravity and abundance of speech is worth, in which there is a certain imperial dignity, you, quirites, have often learned from this very place
humanitate iam tanta est, ut difficile dictu sit, utrum hostes magis virtutem eius pugnantes timuerint an mansuetudinem victi dilexerint.

cognitus, cognita, cognitum known (from experience/carnally)), tried/proved; noted, acknowledged/recognized; cognitus, cognitus act of getting to know/becoming acquainted with;
cognita