Gregory the Great
You shall find no wrongdoing in my speech, nor any foolishness in what I say (Job 6:30). Essentially, this means that the more you examine your words with precision, the more discerning you become regarding the statements of others. When your speech aligns with righteousness, you will be able to recognize true justice in what you hear. My words could never seem absurd to you unless they are influenced by your own concealed thoughts. Consequently, the Holy Church primarily seeks to demonstrate that the claims of her opponents are unfounded, and subsequently to reveal the truth. For as long as they believe they possess the truth, they will continue to challenge the genuine truths they encounter.
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It is crucial, therefore, that those who are misguided first acknowledge their errors to prevent them from dismissing the truth upon hearing it. Just as a farmer must uproot weeds from unyielding soil for the seeds to flourish, or a doctor must cleanse an infected wound to promote healing, it is necessary to first eradicate falsehoods to make way for what is right. Thus, with a commitment to righteousness, let one proclaim, "You shall find no wrongdoing in my speech, nor foolishness from my lips."
In addressing heretics, the Church speaks both openly and discreetly—where the term 'tongue' denotes public discourse while 'jaws' refers to that which is kept hidden. The Holy Church does not speak 'iniquity with her tongue,' nor does 'foolishness issue from her jaws.' She openly articulates all that she simultaneously holds within her faith. She does not teach one principle outwardly while concealing another; rather, she expresses her beliefs through her words and lives in accordance with what she proclaims. The joys of divine wisdom are conveyed through her preaching, and she internally embraces these truths with a reflective spirit. Blessed Job serves as a singular representative of the Church, articulating his personal experiences and reflecting the sentiments of all the elect, so that the integrity of his heart may be evident in his words.