The absence of a title distinguishes it from the mass of Psalms in Book I., and points to its having been derived from a different source. It may have been composed or selected as a preface to the original ‘Davidic’ collection (Introd. p. lviii), or, though this is less probable, placed here by the final editor of the Psalter. The Psalm consists of two equal divisions: i. The enduring prosperity of the righteous (1–3), ii. contrasted with the speedy ruin of the wicked (4–6). Observe the affinity