John Calvin on Matthew 12:22

Matthew 12:22. Then was brought to him. Luke explains from the effect, that the devil by which the man was possessed was dumb; but Matthew says, that a twofold plague had been inflicted on the man. Many persons, no doubt, are blind and deaf on account of natural defects; but it is evident, that this man had become blind, and had been deprived of the use of speech, though there was no defect in his optical nerves, “Aux nerfs appelez Optiques, qui sont les conduits de la veue;”— “in what are called the Optical nerves, which are the conductors of vision.” or in the proportion of his tongue. We need not wonder that so much liberty should be allowed to Satan in injuring the bodily senses, when God justly permits him to corrupt or pervert all the faculties of the soul.