Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 8:19-21

“But some take this to mean that certain men, hating Christ’s teaching, and mocking at Him for His doctrine, said, Thy mother and thy brethren stand without wishing to see thee; as if thereby to shew His meanness of birth. And He therefore knowing their hearts gave them this answer, that meanness of birth harms not, but if a man, though of low birth, hear the word of God, He reckons him as His kinsman. Because however hearing only saves no one, but rather condemns, He adds, and doeth it; for it becomes us both to hear and to do. But by the word of God He means His own teaching, for all the words which He Himself spake were from His Father.”