This reminds me Bertrand Russells's "The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt".

Though in my experience a lot of very intelligent people are pretty cocksure [0] and could do with a dose of humility.

[0] Ref. the word 'cocksure', not that HN will ban me, but twitter might - cf. https://www.bbc.co.uk/news/uk-england-norfolk-64451977