1. ...Behold the Psalm soundeth; it is the voice of some one (and that some one are ye, if ye will), of some one encouraging his soul to praise God, and saying to himself, "Praise the Lord, O my soul" (ver. 1). For sometimes in the tribulations and temptations of this present life, whether we will or no, our soul is troubled; of which troubling he speaketh in another Psalm. But to remove this troubling, he suggesteth joy; not as yet in reality, but in hope; and saith to it when troubled and anxious, sad and sorrowing, "Hope in God, for I will yet confess to Him." ...
Of This addition of the Septuagint intimates that these prophets would thus exhort the people to trust in Providence, and to prefer his service before worldly cares. See Psalm cxxxvi. (Worthington)
They might compose this psalm after Cyrus had revoked the permission to build the temple, (ver. 2., and 1 Esdras i. 3., and iv. 4.) as the following psalms seem all to have been sung at the dedication of the walls. (Calmet)
This might be the case, but the titles afford but a slender proof, and David might write this to excite himself and people to confide in God.
In my. Hebrew begins here the second verse, with the answer of the soul to the prophet's invitation. It is immortal, and promises always to praise the Lord. (Berthier)