Feynman was and will remain, my favorite lecturer (yeah: I'm that old).
He mentioned often (and: I took to heart) his favorite Rule of Life: "Never stop learning!"
For all his genius, he never grew overly confident in his beliefs. The perfect obverse to the Dunning-Kruger sufferer.
ie: “I can live with doubt and uncertainty and not knowing. I think it is much more interesting to live not knowing than to have answers that might be wrong.”
and: “I have approximate answers, and possible beliefs, and different degrees of certainty about different things, but I’m not absolutely sure of anything.”
Tesla is probably my favorite innovator, who (despite the incessant, projectile vomit, from his day's naysayers), took the World, kicking and screaming, into the 20th century, with his inventions.
His thoughts:
“Anti-social behavior is a trait of intelligence in a world full of conformists.”
“All that was great in the past was ridiculed, condemned, combatted, suppressed, only to emerge all the more powerfully, all the more triumphantly from the struggle.”