Here, as Alma is feeling like a massive failure, an angel of the Lord comes and tells him to rejoice! The Lord wasn't concerned that Alma's time in Ammonihah hadn't yielded immediate or measurable success, he was rejoicing in the fact that Alma had been obedient to everything that the Lord had asked Him to do. Can you and I get ourselves to believe that the Lord is equally pleased with our efforts...even on those days that we feel like we have failed?