Albert Barnes Commentary John 4:53

"So the father knew that [it was] at that hour in which Jesus said unto him, Thy son liveth: and himself believed, and his whole house." — John 4:53 (ASV)

The same hour. The very time when Jesus spoke.

The fever left him. It seems that it left him suddenly and entirely, so much so that his friends went to inform the father, to comfort him, and also, doubtless, to apprise him that it was not necessary to ask aid from Jesus.

From this miracle we may learn:

1. That Jesus has an intimate knowledge of all things. He knew the case of this son—the extent of his disease and where he was—and thus had power to heal him.
2. That Jesus has almighty power. Nothing else could have healed this child. Nor could it be pretended that He did it by any natural means. He was far away from him, and the child did not know the source of the power that healed him. It could not be pretended that there was any collusion or trickery. The father came in deep anxiety. The servants saw the cure. Jesus was at a distance. Everything in the case bears the mark of being the simple energy of God—put forth with equal ease to heal, whether far or near. Thus He can save the sinner.
3. We see the benevolence of Jesus. Ever ready to aid, to heal, or to save, He may be called on at all times and will never be called on in vain.

Himself believed. This miracle removed all his doubts, and he became a real disciple and friend of Jesus.

His whole house. His whole family. We may learn from this:

1. That sickness or any deep affliction is often the means of great good. Here the sickness of the son resulted in the faith of all the family. God often takes away earthly blessings that He may impart rich spiritual mercies.
2. The father of a family may be the means of the salvation of his children. Here the effort of a parent resulted in their conversion to Christ.
3. There is great beauty and propriety when sickness thus results in piety. For that is why it is sent. God does not willingly grieve or afflict the children of men; and when afflictions thus terminate, it will be a cause of eternal joy, of ceaseless praise.
4. There is a peculiar charm when piety thus comes into the families of the rich and the noble. It is so unusual; their example and influence go so far; it overcomes so many temptations, and affords opportunities of doing so much good, that there is no wonder that the evangelist selected this instance as one of the effects of the power and of the preaching of the Lord Jesus Christ.