"How long is the night to the watchman; how long is the road to the weary; how long is the wandering of lives ending in death for the fool who cannot find the path!"
"If a fool can seee his own folly, he in this at least is wise; but the fool who thinks he is wise, he indeed is the real fool."
"A wrong action may not bring its reaction at once, even as freash milk turns not sour at once: like a smouldering fire concealed under ashes it consumes the wrongdoer, the fool."
These are from 'The fool' in the Dhammapada. use them wisely.