Theophylact of Ohrid — as excerpted in the Catena Aurea on John 4:46-54

“The little king stands for man generally; man not only deriving his soul from the King of the universe, but having Himself dominion over all things. His son, i. e. his mind, labours under a fever of evil passion and desires. He goes to Jesus and entreats Him to come down; i. e. to exercise the condescension of His pity, and pardon his sins, before it is too late. Our Lord answers; Go thy way, i. e. advance in holiness, and then thy son will live; but if thou stop short in thy course, thou wilt destroy the power of understanding and doing right.”