Experience - the wisdom that enables us to recognise in an undesirable old acquaintance the folly that we have already embraced.
Ambrose BierceCARTESIAN, adj. Relating to Descartes, author of 'Cogito ergo sum' to demonstrate the reality of human existence. The dictum might be improved 'Cogito cogito ergo cogito sum' 'I think that I think, therefore I think that I am' as close an approach.
Ambrose BierceLEAD, n. A heavy blue-gray metal much used in giving stability to light lovers - particularly to those who love not wisely but other men's wives.
Ambrose Bierce