Good works are the mark of a mature Christian. Can some Christians fail to do good works at all? Spiritual maturity is something we all need to strive for, but it is not guaranteed.
Plus, what kind of justification is Matt 12:37 talking about? Believers will be judged for our words, every idle word we say. So we need to be very careful about what we say. Bob and Shawn discuss Matt 12:37 and the importance of being characterized by good fruits.