Luke 8:39

He does not however turn aside from the law of truth, for whatever the Son doth the Father doth. But why does He, who every where charged those who were delivered to tell no one, say to this man who was delivered from the legion, show how great things God hath done for thee? Because in truth that whole country knew not God, and was in bondage to the worship of devils. Or more truly, now that He refers the miracle to His Father, He says, show how great, &c. but when He speaks of Himself He charges to tell no one. But he who was healed of the evil spirits knew Jesus to be God, and therefore published what great things God had done for him. For it follows, And he went through the whole city, &c.

(ubi sup.) But that he, now that he is healed, desires to be with Christ, and it is said to him, Return to thy house, and tell what great things God has done for thee, implies that each should understand, that after the remission of his sins he should return to a good conscience as to his home, and obey the Gospel for the salvation of others, in order that there he may rest with Christ, lest by too early wishing to be with Christ he neglect the ministry of preaching necessary for this redemption of his brethren.

For as one who had been tried by experience, he feared, lest perhaps when far from Jesus he should again become the prey of evil spirits. But the Lord shows him, that though He is not present with him, He can protect by His grace, for it follows, But Jesus sent him away, saying, Return to thine own house, and show how great things God hath done for thee. But he said not, "how great things I have done for thee," giving us an example of humility, that we should attribute all our righteousness to God.