English text caption paraphrased from the "Prado" etching version:

"In all of the sciences their are charlatans who already know everything without having learned anything and yet have a remedy for every ill. One should not believe in what they say, and the intelligent person does not trust them. An educated person is moderate in his promises and keeps them – the Count Palantine does not keep any promises at all."

"En todas ciencias hay charlatanes qe sin haber estrudiado palabra lo saben todo y para todo hallan remedio. No hay q fiarse de lo q anuncian. El verdadero sabio desconfria siempre del acierto: promete poco y cumple mucho; pero el Conde Palatino, no cumple nada de lo q promete.