"No compulsory learning can remain in the soul." - Plato
Spoken by Lord Balfour in the British Parliament (according to James Hilton in The Writer's Digest Handbook of Short Story Writing):
"Gentlemen, I do not mind being contradicted, and I am unperturbed when I am attacked, but I confess I have slight misgivings when I hear myself being explained."
And from an SF master ...
"Jokes of the proper kind, properly told, can do more to enlighten questions of politics, philosophy, and literature than any number of dull arguments." - Isaac Asimov