Augustine of Hippo
Whom do we recognize in this but the one whose anger caused their separation? How did His heart draw close? In a manner that enlightens us to His divine purpose. The Catholic Church has been vindicated through heretics, and those inclined toward malice have inadvertently confirmed the integrity of those who are upright. Numerous truths were concealed within the Scriptures, and as the heretics faced destruction, they troubled the congregation of God with their inquiries; then the hidden truths were unveiled, and God's intentions became apparent. Another Psalm states: 'To exclude those who are tested like silver.' For He commands, let them be excluded, let them depart, let them reveal themselves.
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Thus, even among silversmiths, those who refine silver are termed excluders, signifying those who compress and distort due to a mingling of the piece. There were indeed many among God’s people who possessed the ability to fully comprehend and interpret the Scriptures; yet, they refrained from addressing intricate questions when no malefactor summoned them again. Was the doctrine of the Trinity rightly honored before the Arians challenged it? Did the concept of repentance receive due respect prior to the opposition of the Novatians? Similarly, was Baptism correctly honored prior to the outwardly marked disputants challenging it? Even the unity of Christ was not elucidated until divisions began to press upon the fragile, compelling those who could thoughtfully engage with these matters—so that the weak would not suffer under the burdensome inquiries of the wicked—to elucidate the obscurities within the law through their dialogues and debates.
Observe how the Apostle draws forth the meaning of this obscurity; he asserts that heresies are necessary so that those approved may be revealed among you. What does it mean to be approved? To be tested by silver, to be validated by the word. What can be made known? It can be demonstrated. Why is that? Because of the heretics. Thus, they were divided by the wrath of His countenance, yet His heart was united. His assertions are smoother than oil, yet are sharp like arrows. Certain texts in the Scriptures appeared challenging, though clouded in mystery; once clarified, they became gentler. Indeed, the first heresy arising among Christ’s followers was provoked by the severity of His declaration. For when He stated, "Unless one eats My flesh and drinks My blood, he has no life in him," they exchanged glances, not comprehending, saying, "This saying is hard; who can listen to it?" They proclaimed, "This teaching is challenging," and withdrew from Him, leaving only the twelve. When they expressed their discontent concerning His pronouncements, He asked, "Will you also leave?" Then Peter replied, "Lord, to whom shall we go? You have the words of eternal life." Take notice, dear ones, and learn piety. Did Peter comprehend the depth of the Lord’s teachings at that moment? Not fully; yet, he recognized the profound goodness in those words he did not grasp. Therefore, if the message is difficult and remains not fully understood, it may indeed seem harsh to the unrighteous; but for you, it will be softened by piety. Once resolved, it shall be as oil to you, penetrating even to your bones. Furthermore, convinced by their indignation towards what they perceived as the Lord’s severity, Peter queried, "To whom shall we go?" followed by counsel: "Cast your burdens on the Lord, and He will sustain you." Do not resent the nurturing words; they shall prepare you for the feast for which you currently may not be ready. By the divisions among heretics, many challenging concepts are softened: the once difficult words are now smoother than oil, and yet they remain sharp. Armed, they proclaim the Gospel, and every utterance pierces the hearts of those who listen, compelling them towards love for the world. Difficult they were, and yet they have been softened. Even in their refinement, they have not lost their potency; instead, they have become like arrows. Commit yourselves to the Lord, for entrusting yourselves to Him is paramount—let no one take His place. Cast your burdens upon the Lord.