
But there is another meaning to the phrase secret sins, one more relevant to us. David says “who will acquit me of my secret sins [or hidden faults]” (Ps. 19:12). The common interpretation of “secret faults” is those that are hidden from the one who committed them, unconscious sins, sins of ignorance.
Augustine said: “Secret sins, sins which my conscience has been unable to detect, are like private conspirators. They must be hunted out or they may do deadly mischief; it is well to be much in prayer concerning them.” His words reveal the heart of a man who wants nothing to separate him from God. Likewise, David prayed “Search me, O God, and know my heart; test me and know my anxious thoughts. See if there is any offensive way in me” (Ps 139:23-24). It takes faith to pray that way. And that’s no secret.