Offer the sacrifices of righteousness, and put your trust in the LORD.
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Augustine of Hippo
7. "Offer the sacrifice of righteousness, and hope in the Lord" (ver. 5). He says the same in another Psalm, "the sacrifice for God is a troubled spirit." Wherefore that this is the sacrifice of righteousness which is offered through repentance it is not unreasonably here understood. For what more righteous, than that each one should be angry with his own sins, rather than those of others, and that in self-punishment he should sacrifice himself unto God? Or are righteous works after repentance the sacrifice of righteousness? For the interposition of Diapsalma not unreasonably perhaps intimates even a transition from the old life to the new life: that on the old man being destroyed or weakened by repentance, the sacrifice of righteousness, according to the regeneration of the new man, may be offered to God; when the soul now cleansed offers and places itself on the altar of faith, to be encompassed by heavenly fire, that is, by the Holy Ghost. So that this may be the meaning, "Offer the...
Justice. External devotion will not suffice. (St. Chrysostom)
No sacrifice will please God as long as people take part with rebels. (Calmet)
Besides external sacrifices, which have always been required, and those of praise and contrition, (Psalm xlix., and l.) we must offer to God the sacrifice of justice, by complying with our duties to him, ourselves, and neighbours, and by hating sin, and also the world, the flesh, and the devil, which prompt us to offend, and thus to give the preference to vanity. For this purpose, we must not trust in ourselves, but in God; and that no one may plead ignorance, the light of reason and grace is given us, plainly indicating that we have a God to serve, and must expect reward or punishment, Hebrews xi. 6. (Worthington)