And he has put a new song in my mouth, even praise unto our God: many shall see it, and fear, and shall trust in the LORD.
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Augustine of Hippo
4. "And He hath put a new song in my mouth." What new song is this? "Even a hymn unto our God" (ver. 3). Perhaps you used to sing hymns to strange gods; old hymns, because they were uttered by the "old man," not by the "new man;" let the "new man" be formed, and let him sing a "new song;" being himself made "new," let him love those "new" things by which he is himself made new. For what is more Ancient than God, who is before all things, and is without end and without beginning? He becomes "new" to thee, when thou returnest to Him; because it was by departing from Him, that thou hadst become old; and hadst said, "I have waxed old because of all mine enemies." We therefore utter "a hymn unto our God;" and the hymn itself sets us free. "For I will call upon the Lord to praise Him, and I will be safe from all mine enemies." For a hymn is a song of praise. Call on God to "praise" Him, not to find fault with Him. ...
5. If haply any one asks, what person is speaking in this Psalm? I woul...
New. Excellent. (Haydock)
I was before uttering complaints, now I give thanks with joy, for my health and conversion. (Calmet)
Song. Hebrew, "Praise. "The penitent changes his language, which is no longer understood by world lings. (Berthier)
Many. St. Augustine reads, the just, who take part in the welfare of their brethren, (Psalm xxxi. 11.) while the wicked are filled with alarm, at the ways of God; who humbles or exalts people as he pleases. (Calmet) ...