This is the first of a series of eight psalms Ps. 138–145, placed together in this part of the book, and ascribed to David. They appear to be of the nature of a supplement to the Book of Psalms, composed of psalms unknown to the original collector and arranger of the book, and subsequently discovered and ascertained to be the works of David. It is not to be regarded as strange that there should be psalms of this nature David at different periods which might have been preserved in different branches of his family, and which might not have been generally known to exist. It is rare that the works of an author, especially a poet, are collected and published, and that things of this kind - fugitive and occasional pieces - are not subsequently found; nor is it very unusual that such pieces may, after all, be among the most tender, touching, and beautiful of his compositions. Burns’ Highland Mary,” so much admired, and his “When wild War’s deadly blast was blown,” a poem which no one can read without tears - with not a few others of his, are of this description. They are said, in his Biography, to have been “extracted from the correspondence of Burns.” (Works of Robert Burns, Philad., 1834, pp. 76, 85, 89.)
The occasion on which this psalm was composed cannot now be determined. It was evidently written in view of trouble Psalms 138:3, Psalms 138:7, and it expresses confidence that God would interpose in the future in behalf of the author, as he had done in the past; and it is, therefore, adapted to inspire confidence and hope in all who are called to pass through scenes of trial. The psalm does not admit of any particular analysis.