Irenaeus : Such [a line of conduct] belongs not to those who heal, or who give life: it is rather that of those bringing on diseases, and increasing ignorance; and much more true than these men shall the law be found, which pronounces every one accursed who sends the blind man astray in the way. For the apostles, who were commissioned to find out the wanderers, and to be for sight to those who saw not, and medicine to the weak, certainly did not address them in accordance with their opinion at the time, but according to revealed truth. For no persons of any kind would act properly, if they should advise blind men, just about to fall over a precipice, to continue their most dangerous path, as if it were the right one, and as if they might go on in safety. Or what medical man, anxious to heal a sick person, would prescribe in accordance with the patient's whims, and not according to the requisite medicine? But that the Lord came as the physician of the sick, He does Himself declare saying, "They that are whole need not a physician, but they that are sick; I came not to call the righteous, but sinners to repentance." — AGAINST HERESIES 3.5.2