Doctrine & Covenants 39-40
His heart WAS right.
We don't know too much about James Covill. Apparently, he heard and accepted the gospel and was promised great blessings. However, he later let temptations and the cares of the world lure him off the gospel path, and the blessings were revoked. It's not enough to believe once, we have to keep our hearts "right" until the end.
Alma 5:26 - "If ye have experienced a change of heart, and if ye have felt to sing the song of redeeming love, I would ask, can ye feel so now?"