Human nature inherently limits a person's ability to achieve absolute spiritual perfection. Even when someone possesses a sincere desire and exercises great caution to observe God's commandments, avoiding mistakes entirely is impossible due to the boundaries of human understanding. Recognizing this reality naturally leads to a plea for God's grace and forgiveness for those sins committed without intent or awareness.
The primary approach among commentators is that human beings simply lack the capacity to avoid unintentional failures entirely. Despite a person's best efforts to be careful, no one can know and understand everything, making errors inevitable [רש״י, רד״ק, אבן עזרא]. Often, individuals act with the full belief that they are doing nothing wrong. They remain completely unaware of their errors because the true nature of their actions is hidden from them [ביאור שטיינזלץ, מצודת דוד]. Because these transgressions remain unseen and unacknowledged by the person committing them, there is a profound need to ask God to cleanse these hidden faults, grant forgiveness, and withhold punishment [רש״י, רד״ק].
According to the Midrash, this plea for cleansing is part of a much larger request made by King David. He sought sweeping forgiveness from God for all his failings—unintentional mistakes, hidden faults, and even intentional sins. He went so far as to ask that his transgressions be completely omitted from the historical record so that future generations would not read about them. While God granted him forgiveness for the sins themselves, He refused the request to erase the record of them from the scriptures [תורה תמימה].
When exploring the exact nature of these unintentional sins, there are varying perspectives on how to categorize them. Some maintain that there is no real distinction between general errors and hidden faults; both concepts together encompass all types of unintentional wrongdoing, whether they stem from a mistaken physical action or an ignorance of the law [מאירי]. Others, however, see a precise division between two different kinds of accidental sins. One perspective suggests that general errors are practical mistakes in reality—such as knowing the law but failing to apply it correctly, like momentarily forgetting it is the Sabbath. In contrast, hidden faults refer to a complete ignorance of the law itself [אלשיך]. Conversely, another approach argues the exact opposite. In this view, general errors are intellectual misjudgments where a person analyzes the law incorrectly, mistakenly believing a forbidden act is permitted. Hidden faults, on the other hand, are strictly practical accidents, such as unknowingly swapping a permitted object for a forbidden one [מלבי״ם].