The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.
modern · analytic-philosophy
Bertrand Russell
Bertrand Russell · 1872–1970
Logician and public scold of the cocksure. The stupid are certain; the intelligent, full of doubt.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.
Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.