Brother, there is hope even when you fall into known sin, if only, unlike David, you will seek God's forgiveness. The sacrifice of Jesus is for when we turn to Him as our High Priest, serving daily in the heavenly temple. If we don't go to Jesus daily, there is no sacrifice for our known sin, as in the case of David, who did not seek forgiveness before God intervened through Nathan, His prophet. Like David, if you don't seek God's forgiveness, there is no sacrifice to cover your known sin. We may not always obey, like David, but we can always seek forgiveness. David was lost without God intervening with Nathan because he did not seek God's forgiveness to deal with his known sin according to God's provision to learn not to fall into known sin, as a child learns to walk by repeatedly getting up through God's forgiveness until we learn not to fall into known sin.
So the Lord sent Nathan the prophet to tell David this story: “There were two men in a certain town. One was rich, and one was poor. The rich man owned a great many sheep and cattle. The poor man owned nothing but one little lamb he had bought. He raised that little lamb, and it grew up with his children. It ate from the man’s own plate and drank from his cup. He cuddled it in his arms like a baby daughter. One day a guest arrived at the home of the rich man. But instead of killing an animal from his own flock or herd, he took the poor man’s lamb and killed it and prepared it for his guest.” David was furious. “As surely as the Lord lives,” he vowed, “any man who would do such a thing deserves to die! He must repay four lambs to the poor man for the one he stole and for having no pity.” Then Nathan said to David, “You are that man! (2 Samuel 12:1-7a NLT)
United in our hope for the soon return of Jesus, Jorge