3:8-11 When the grace of God towards mankind has been declared, the necessity of good works is pressed. Those who believe in God, must make it their care to maintain good works, to seek opportunities for doing them, being influenced by love and gratitude. Trifling, foolish questions must be avoided, and subtle distinctions and vain inquiries; nor should people be eager after novelties, but love sound doctrine which tends most to edifying. Though we may now think some sins light and little, if the Lord awaken the conscience, we shall feel even the smallest sin heavy upon our souls.

11. is … subverted—"is become perverse."

condemned of himself—He cannot say, no one told him better: continuing the same after frequent admonition, he is self-condemned. "He sinneth" wilfully against knowledge.