蓬生麻中,不扶而直;白沙在涅,与之俱黑。兰槐之根是为芷,其渐之滫,君子不近,庶人不服。其质非不美也,所渐者然也。故君子居必择乡,游必就士,所以防邪辟而近中正也。物类之起,必有所始。荣辱之来,必象其德。肉腐出虫,鱼枯生蠹。怠慢忘身,祸灾乃作。强自取柱,柔自取束。邪...