The hidden things of the son. The humility and sufferings of Christ, the Son of God; and of good Christians, who are his sons by adoption; and called hidden things, with regard to the children of this world, who know not the value and merit of them. (Challoner)

It may also signify, “to Ben, the master of music, over the young women.” See 1 Paralipomenon xv. 18. (Calmet; Menochius)

These authors have joined álmuth, which St. Jerome, &c., read as two words, “on the death of the son.” Protestants, “upon Muth Labben.” David might allude to the death of Absalom, or of some of his other children. But he has his Son, Christ, the conqueror of death and hell, principally in view, as this psalm sings of victory over nations. His incarnation and the afflictions of Christians are hidden in God. (Worthington)

Lamnatseach has generally a preposition, l, ál, &c., after it, which might induce us to prefer rendering “death,” before “secrets or young women.” (Haydock)

But al may be understood, as it is found [in] Psalm xlv., where all have, “for the secrets.” In Hebrew, this psalm is divided (Berthier) at ver. 22nd, and formerly it seems at the 17th. (Calmet)

This division is arbitrary, and of no consequence for the understanding of the psalms. (Berthier)

It would be well if there were no more serious controversy between Catholics and Protestants. The Jews agree with neither. Some unite the 1st and 2nd, as Kimchi does the 114th and 115th. (Amama)

What is here rendered a psalm for David, is the same in the Hebrew and Septuagint as has been before expressed of David, Psalm iii. (Haydock)