Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 8:26-39

“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 shews 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 shew 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.”