De Agricultura

And this ought to happen to those who allow themselves to be deceived by the sophists; for when they are not able to find a solution for their sophisms, believing their fallacies as if they were true statements, they die as to the life of knowledge, suffering the same thing that they do who are cajoled by flatterers; for in the case of those men too, their soul, while in a healthy and genuine state, is driven off and overthrown by a friendship which is diseased in its very nature.