With the partial exception of Psalm xlv., which is a marriage song, the songs of the Psalter are exclusively religious. Indeed most of the poetry of the Old Testament is religious; the Song of Deborah, e.g. (Jud. v.), or the Psalm of Hezekiah (Isa. xxxviii.). But, from scattered hints it is abundantly plain that, especially before the exile, Hebrew poetry must have ranged over a wide variety of themes. So far as we know, the Hebrews never had an epic; and though a certain epic power is occasionally suggested by the extant literature, it may be doubted whether the Hebrew genius, which was essentially lyrical, would have been capable of the long sustained effort demanded by a great epic. But the lyrical genius of the Hebrew found abundant opportunity in life's common joys, sorrows and activities. Victories in battle were celebrated in ballads, which made the blood leap, love songs were sung at weddings, and dirges were chanted over the dead. The labour of drawing water, of reaping the fields or gathering the vintage, was relieved by snatches of song. There was all this and more, but it has nearly all perished, leaving little more than an echo, because the men who compiled and edited the Old Testament were dominated by an exclusively religious interest. But if the interest of the Psalter be exclusively religious, we have no reason to complain of its variety. From the deepest despair to the highest exaltation, every mood of the soul is uttered there. Many a classification of the Psalter has been attempted, e.g. into (_a_) psalms of gladness, such as thanksgiving (xlvi.), adoration (viii.); (_b_) psalms of sadness, such as lamentation (lxxiv.), confession (li.), supplication (cii.); (_c_) psalms of reflection, such as the occasional didactic poetry (cxix.), or discussions of the moral order (lxxiii.). But in the nature of the case, no classification can ever hope to be completely satisfactory, if for no other reason than that the psalms, being for the most part lyrics, are often marked by subtle and rapid changes of feeling, passing sometimes, as in Psalm xxii., from the most touching laments to the most daring expressions of hope and gladness. The following classification, though exposed, as all such classifications must be, to the charge of cross-division, will afford a working basis for the study of the Psalter:-- (1) Psalms of Adoration, including (_a_) adoration of God for His revelation in nature, viii., xix. 1-6, xxix., civ.; (_b_) adoration of Him for His love to His people, xxxiii., ciii., cxi., cxiii., cxv., cxvii., cxlvii.; (_c_) praise of His glorious kingdom, cxlv., cxlvi., ending with the call to universal praise, cxlviii., cl.