Augustine of Hippo
It is essential to reflect on whether a seemingly upright individual carries unseen guilt, for the Supreme Judge of all morality, whose awareness encompasses every violation, reigns on high. No one can truly claim to have a flawless heart, nor can anyone assert that they are free from sin. This assertion belongs only to those who seek to exalt their own righteousness rather than relying on the grace found in His judgment.
Sin and Instruction It should be recognized that it is not the one who tests the Lord who gains insight into himself that was previously unknown, but rather the individual who, amidst temptation, inquires of God regarding the concealed matters within a heart filled with secrets. Human understanding of oneself pales in comparison to God's complete knowledge. Just as a patient lacks awareness of his own afflictions in the way that a healer comprehends them. Humanity is afflicted; it endures suffering, while the healer remains unscathed, and thus expects to receive knowledge of the ailment from the one who is in pain. This is why in the Psalm a person implores: Cleanse me from my hidden sins, O Lord. There exists within humanity aspects that remain obscured from self-awareness. Such hidden truths will not be illuminated or unveiled except through the trials of temptation. If the Lord ceases to test, the Teacher no longer instructs.
May I not be misled by others. For one who has purified himself from his own faults is not merely a casualty of another's mistakes. Therefore, safeguard me from the desires of others, not as a haughty person seeking to be self-governing, but as Your servant. If they hold no dominion over me, I will stand guiltless. If neither my hidden transgressions nor the wrongs of others can overtake me, I shall remain blameless. For there exists no other source of sin apart from my own concealed misdeeds, which led to the devil's fall, and the sins of others, by which one can be enticed into accepting them as his own. Thus, I will be purified from significant wrongdoing. What else could be the root but pride?
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For there is nothing that surpasses turning away from God, which marks the onset of human arrogance. Sirach 10:12 And he will be regarded as blameless who is also free from this transgression; for this is the final offense for those who seek to return to God, echoing the very first transgression made when they strayed from Him.