The wise men of old have sent most of their morality down the stream of time in the light skiff of apothegm or epigram; and the proverbs of nations, which embody the commonsense of nations, have the brisk concussion of the most sparkling wit. – Edwin P. Whipple, lecture delivered before the Boston Mercantile Library Associa

Then your words of abuse today may turn into a universally valid principle of denigration, for words are magical formulae. They leave fingermarks behind on the brain, which in the twinkling of an eye becomes the footprints of history. One ought to watch one’s every word. – Franz Kafka, quoted by Gustav Janouch, Conversations with Kafka