I pass on to the book of Psalms, of which it is not necessary to make much observation. Some of them are moral, and others are very revengeful; and the greater part relates to certain local circumstances of the Jewish nation at the time they were written, with which we have nothing to do. It is, however, an error or an imposition to call them the Psalms of David; they are a collection, as song-books are now-a-days, from different song-writers, who lived at different times. The 137th Psalm could not have been written till more than 400 years after the time of David, because it is written in commemoration of an event, the captivity of the Jews in Babylon, which did not happen till that distance of time.
Psalms 137:1-3
By the rivers of Babylon we sat down; yea, we wept when we remembered Zion. We hanged our harps upon the willows, in the midst thereof; for there they that carried us away captive required of us a song, saying, sing us one of the songs of Zion.
As a man would say to an American, or to a Frenchman, or to an Englishman, sing us one of your American songs, or your French songs, or your English songs. This remark, with respect to the time this psalm was written, is of no other use than to show (among others already mentioned) the general imposition the world has been under with respect to the authors of the Bible. No regard has been paid to time, place, and circumstance; and the names of persons have been affixed to the several books which it was as impossible they should write, as that a man should walk in procession at his own funeral.