For the correct analogy for the mind is not a vessel that needs filling, but wood that needs igniting.
PlutarchIf you declare that you are naturally designed for such a diet, then first kill for yourself what you want to eat. Do it, however, only through your own resources, unaided by cleaver or cudgel or any kind of ax
PlutarchLet a prince be guarded with soldiers, attended by councillors, and shut up in forts; yet if his thoughts disturb him, he is miserable.
Plutarch