John Calvin Commentary John 4:52

"So he inquired of them the hour when he began to amend. They said therefore unto him, Yesterday at the seventh hour the fever left him." — John 4:52 (ASV)

Therefore he inquired at them. That this courtier asked his servants at what time his son began to recover was done by a secret impulse from God, so that the truth of the miracle might be rendered more conspicuous. For by nature we have an exceedingly wicked disposition to extinguish the light of God's power, and Satan labors, by various means, to hide God's works from our view; and, therefore, so that they may obtain from us the praise that is due to them, they must be made so manifest that no room is left for doubt. Thus, whatever the ingratitude of men may be, this circumstance still does not permit such an illustrious work of Christ to be ascribed to chance.