This Psalm is not usually numbered, but it might well be, amongst the penitential psalms. Its pensiveness is that of contrition. From the Divine attributes which it accentuates, and from its expressions, as well as from the tone that runs through it, we see a tender conscience, healed and lowly, sensible of fault, rejoicing in forgiveness. The Psalmist dwells on God's mercy, on His longsuffering, on His readiness to forgive, as only they dwell who have the broken and contrite heart.
I. Observe that wherever you find contrition you find a light peculiarly its own, an unusual brightness, a lofty hope; a vision of God amazing in its clearness, and a vision of man remarkable for its brightness and its faith. We cannot by searching find out God, but we can by trusting.
II. Observe the hope which is expressed in the text, "All nations whom Thou hast made shall come and worship before Thee.' It is a great dream; it is a dream of universal religion one creed for every variety of man, in all conditions, in all stages of civilisation; one vision of God to charm them; one song of praise and triumph rising over all mankind. Concerning this hope, we remark: (1) that all the holy have cherished it; (2) that it has been marvellously realised in the history of the world in the past; (3) that it is a consummation devoutly to be wished. (4) Think what might have been accomplished already if the Church had done her work.
III. Notice the lessons which these things enforce. (1) Let us repent of our despair and believe in the truth of God; (2) let us repent of the little we have done to speed forward the work; (3) let us labour at home and abroad, expecting not failure, but the thirty-fold, the sixty-fold, the hundred-fold, promised by our Lord.
R. Glover, Christian World Pulpit,vol. xxvii., p. 260.