H.P. Lovecraft - (1922) The Tomb
"If the form of information is difficult to assimilate, that affects our judgments about the substance of that information."
Leonard Mlodinow - Subliminal: How your unconscious rules your behavior
"Mankind have a great aversion to intellectual labor; but even supposing knowledge to be easily attainable, more people would be content to be ignorant than would take even a little trouble to acquire it."
Samuel Johnson - (1709 - 1784)
(this last one is admittedly a bit cynical - but there are some people...)