George Haydock's Catholic Commentary
Psalms 17:51
Great. This in intimated by the plural salutes, "salvations;" as David had experienced innumerable favours. (Haydock) --- He speaks of himself in the third person, to lead our minds to the Messias, in whom this was more gloriously accomplished. The greater honour of this chief family of Israel, consisted in giving birth to so great a personage, in whom all are blessed. (Calmet) (Isaias xi. 1., and Ezechiel xxxiv. 23.) --- For ever. The true Church will never perish; (Haydock) God still protecting it, as he did David, ver. 48. (Worthington)