Celebrations in 2017 of the five-hundredth anniversary of the Reformation will return again and again to the subject of justification by faith alone, one of the Reformation’s most critical rediscoveries. That subject is so important that in one sense we cannot study it enough. On the other hand, part of me wonders why we seem to have so much trouble understanding and holding on to a doctrine so vital. Is the doctrine so complicated that we cannot remember it? Is the Bible’s teaching so obscure that we cannot penetrate it?