The mention of the "fear of the Lord" prepares the way for the transition to the third part of the psalm. It is purely didactic, and, in its simple moral teaching and familiar contrast of the fates of righteous and ungodly, has affinities with the Book of Proverbs; but these are not so special as to require the supposition of contemporaneousness. It is unfashionable now to incline to the Davidic authorship; but would not the supposition that the "children," who are to be taught the elements of religion, are the band of outlaws who have gathered round the fugitive, give appropriateness to the transition from the thanksgiving of the first part to the didactic tone of the second? We can see them sitting round the singer in the half-darkness of the cave, a wild group, needing much control and yet with faithful hearts, and loyal to their leader, who now tells them the laws of his camp, at the same time as he sets forth the broad principles of that morality, which is the garment and manifestation among men of the "fear of the Lord." The relations of religion and morals were never more clearly and strikingly expressed than in the simple language of this psalm, which puts the substance of many profound treatises in a nutshell, when it expounds the "fear of Jehovah" as consisting in speaking truth, doing good, abhorring evil and seeking peace even when it seems to flee from us. The primal virtues are the same for all ages and stages of revelation. The definition of good and evil may vary and become more spiritual and inward, but the dictum that it is good to love and do good shines unalterable. The psalmist's belief that doing good was the sure way to enjoy good was a commonplace of Old Testament teaching, and under a Theocracy was more distinctly verified by outward facts than now; but even then, as many psalms show, had exceptions so stark as to stir many doubts. Unquestionably good in the sense of blessedness is inseparable from good in the sense of righteousness, as evil which is suffering is from evil which is sin, but the conception of what constitutes blessedness and sorrow must be modified so as to throw most weight on inward experiences, if such necessary coincidence is to be maintained in the face of patent facts.