874. This scene depicts the first stage of regeneration following trial for the people of this church, a stage common to everyone who is being reborn: we imagine that we are doing good deeds and thinking true thoughts under our own power. Because we still cannot see clearly at all, the Lord lets us think this way.
Still, none of the good we do and none of the truth we contemplate while holding this opinion (a mistaken one) is the kind of goodness or truth that makes a part of faith. Nothing that we produce from ourselves can be good, because it is from ourselves — an impure and very unclean source. From an impure and unclean source nothing good can spring, because we are always thinking about how deserving and righteous we are. Some people, as the Lord teaches in Luke 18:9-14, go further and despise others in comparison with themselves. Others do other things just as bad. Self-centered desires add themselves to the mixture, making the exterior look good, although the interior is filthy.
As a consequence, the good that we do at this stage is not the good that belongs to faith. It is the same with the truth that we think. Even if the idea we adopt is absolutely true and is in itself a valid religious concept, nonetheless as long as we adopt it for selfish reasons, it has no religious good within it. Any truth, in order to be theologically true, has to have the good of faith from the Lord within it. That is when it first becomes good and true.
(References: Genesis 8:9)