John Calvin on Mark 8:24-25

Mark 8:24. I see men. Our Lord had put the question to the blind man for the sake of his disciples, to inform them that the man had received something, but that hitherto nothing more than a slight commencement of the cure had been effected. The reply is, that he sees men, because he perceives some persons walking who are upright like trees By these words he acknowledges that his sight is not yet so clear as to distinguish men from trees, but that he has already obtained some power of seeing, because he conjectures from the motion that those whom he perceives to be in an erect posture are men; and it is in this respect that he says they are like trees We see then that he speaks only by conjecture when he says that he sees men