Plutarch De Vitioso Pudore 11

[11] Again, Plato writing to Dionysius, by Helicon of Cyzicus, gives the bearer a good character for honesty and moderation, but withalin the postscript tells him, Yet this I write of a man, who, as such, is by nature an animal subject to change. Xenocrates, though a man of rigid morals, was prevailed upon by this kind of modesty to recommend to Polysperchon a person, as it proved in the end, not so honest as he was reputed. For when the Macedonian in compliment bade him call for whatever he wanted, he presently desired a talent of silver. Polysperchon ordered it accordingly to be paid him, but despatched away letters immediately to Xenocrates, advising him for the future to be better acquainted with those he recommended. Now all this came to pass through Xenocrates’s ignorance of his man; but we oftentimes give testimonials and squander away our money to advance such as we are very well satisfied have no qualification or desert to recommend them, and this too with the forfeiture of our reputation, and without the pleasure that men have who are profuse upon whores and flatterers, but all the while in an agony, and struggling with that impudence which does violence to our reason. Whereas, if at any time, that verse can here be properly used,— when such persons are at a man to forswear himself, or to give a wrong sentence, or to vote for an unjust bill, or lastly to be bound for one that will never be able to pay the debt.