John Chrysostom
"Offer sacrifices of righteousness and trust in the Lord." Can you perceive the harmony of wise guidance? Do you recognize the flawless counsel? After admonishing his listeners for their transgressions, making them less eager to engage in such actions, granting them an incorruptible verdict, and requiring an account of their lives, he subsequently directs them towards virtuous practices. Simply refraining from wrongdoing is insufficient; we must strive to perform good deeds. This is why he continues with the exhortation: "Abstain from evil, and do good" (Psalms 33:15). In truth, neglecting to perform acts of virtue subjects one to punishment just as much as committing sins does.
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Those who have not fed the hungry, given drink to the thirsty, or clothed the naked have not stolen, engaged in greed, or taken what does not belong to them; yet, their failure to perform acts of charity subjects them to eternal punishment and unending torment. Thus, we learn that merely abstaining from evil does not lead to salvation unless it is accompanied by the pursuit of good and the fulfillment of virtue. Therefore, the prophet, having turned the listener away from sins through true repentance, prepared him to do good, softened the hardness of the heart, and made it receptive through inner contrition, begins his teaching on truth, saying: "Offer sacrifices of righteousness and trust in the Lord." What does it mean to "offer sacrifices of righteousness"? It means to embrace the truth, to present the truth; this offering to God is the highest gift, a sacrifice that pleases Him, an offering that is highly esteemed, which does not depend on the slaughter of animals, but rather on the performance of righteous acts. You can see how the life of the Church has been transformed since ancient times, with spiritual offerings now required instead of carnal sacrifices. As mentioned earlier, righteousness is not a singular form of virtue, but encompasses virtue as a whole; much like we refer to a righteous person as one who possesses all virtues. This offering requires no money, knife, altar, or fire; it does not turn to smoke, odor, or ashes, but is fulfilled solely through the heart of the one who presents it. Neither poverty nor lack of resources presents an obstacle, nor does one's location hinder it; you can offer it wherever you are, being yourself both priest and altar, knife and sacrifice. Such are the reasonable and spiritual sacrifices: they require no extensive preparation and can be performed with great ease. "And trust in the Lord." Another version reads: "and trust (πεποίθετε) in the Lord." He who lives righteously has won the grace and favor of the Lord, possessing in Him the mightiest advocate, an unbeatable ally, and receives significant support from Him. Do you see how the fruit of this sacrifice becomes apparent immediately? Do you see the outpouring of blessings that arises from it? Indeed, who will fear when God is their helper? No one. This is a vital virtue—hoping in Him and being assured in Him. Alongside truth, the prophet calls us to this virtue: to place our confidence in God, to hope in Him, not to depend on worldly matters, but, by denying ourselves of such things, to hold fast to Him in our thoughts. Indeed, the concerns of this life resemble dreams and shadows, even less substantial; they appear for a moment and then vanish, causing much distress to those who possess them; but hope in God is everlasting, stable, unshakeable, immutable, providing perfect security and rendering invincible the one who safeguards it with the right spirit.