4. The solemn divine voice reads the lesson of the power of sin, when once done, over the sinner. Like a wild beast, it crouches in ambush at his door, ready to spring and devour. The evil deed once committed takes shape, as it were, and waits to seize the doer. Remorse, inward disturbance, and above all, the fatal inclination to repeat sin till it becomes a habit, are set forth with terrible force in these grim figures. What a menagerie of ravenous beasts some of us have at the doors of our hearts! With what murderous longing they glare at us, seeking to fascinate us, and make us their prey! When we sin, we cannot escape the issues; and every wrong thing we do has a kind of horrible life given it, and sits henceforth there, beside us, ready to rend us. The tempting, seducing power of our own evils was never put in more startling and solemnly true words, on which the bitter experience of many a poor victim of his own past is a commentary. The eternal duty of resistance is farther taught by the words. Hope of victory, encouragement to struggle, the assurance that even these savage beasts may be subdued, and the lion and adder (the hidden and the glaring evils--those which wound unseen, and which spring with a roar) may be overcome, led in a silken leash or charmed into harmlessness, are given in the command, which is also a promise, 'Rule thou over it.' 5. The deadly fruit of hate is taught us in the brief account of the actual murder. Notice the impressive plainness and fewness of the words. 'Cain rose up against his brother, and slew him.' A kind of horror-struck awe of the crime is audible. Observe the emphasis with which 'his brother' is repeated in the verse and throughout. Observe, also, the vivid light thrown by the story on the rise and progress of the sin. It begins with envy and jealousy. Cain was not wroth because his offering was rejected. What did he care for that? But what angered him was that his brother had what he had not. So selfishness was at the bottom, and that led on to envy, and that to hatred. Then comes a pause, in which God speaks remonstrances,--as God's voice--conscience--does now to us all,--between the imagination and the act of evil. A real or a feigned reconciliation is effected. The brothers go in apparent harmony to the field. No new provocation appears, but the old feelings, kept down for a time, come in again with a rush, and Cain is swept away by them. Hatred left to work means murder. The heart is the source of all evil. Selfishness is the mother tincture out of which all sorts of sin can be made. Guard the thoughts, and keep down self, and the deeds will take care of themselves.