John Calvin Commentary Matthew 12:22

"Then was brought unto him one possessed with a demon, blind and dumb: and he healed him, insomuch that the dumb man spake and saw." — Matthew 12:22 (ASV)

Then was brought to him. Luke explains from the effect that the devil by whom 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 because 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,¹⁰⁴ or in the proportion of his tongue. We should 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.

¹⁰⁴ “Aux nerfs appelez Optiques, qui sont les conduits de la veue;”— “in what are called the Optical nerves, which are the conductors of vision.”;”— “in what are called the Optical nerves, which are the conductors of vision.”