New Defender's Study Bible Notes
4:48 signs and wonders. Obviously the Lord would not encourage the modern emphasis on signs and wonders as incentives to faith.
4:50 thy son liveth. Simply by a word, the Lord Jesus healed a young man who was near death. Not only did Jesus not even touch him, he was over ten miles away! This was a second miracle of creation, requiring nothing less than the power of the Creator Himself!
4:54 second miracle. Jesus actually had done many miracles in or near Jerusalem (John 2:23; 3:2) since the miracle of turning the water into wine. This is called the second miracle, either because it was the second done in Galilee or else because John was specifically counting only the seven great signs (all of these being miracles of creation) described in detail in order to win men to Christ (John 20:30,31).