Seems as good here as anywhere in this Schools section:
“Perhaps the sentiments contained in the following pages, are not yet sufficiently fashionable to procure them general favor; a long habit of not thinking a thing wrong, gives it a superficial appearance of being right, and raises at first a formidable outcry in defence of custom. But tumult soon subsides. Time makes more converts than reason.” – - Thomas Paine, February 14, 1776