George Haydock's Catholic Commentary
Psalms 21:20
Thy help. So some editions of the Septuagint read, but St. Jerome approves "my help," as it is in the Com. edition, conformably to the Hebrew, (Calmet) which seems more animated, though the sense is the same. (Berthier) --- The humanity here addresses the divine nature, to obtain a speedy resurrection. (St. Jerome) --- Hebrew, "O, my strength, haste thou to help me." What is man when left to himself! The whole of a spiritual life consists in keeping close to God, and being convinced of our own infirmity. (Berthier)