If you are in the dark, it does not mean that you have failed and that you have taken some terrible misstep. For many years I thought my questions and my doubt and my sense of God's absence were all signs of my lack of faith, but now I know this is the way the life of the spirit goes.
Look at this window: it is nothing but a hole in the wall, but because of it the whole room is full of light. So when the faculties are empty, the heart is full of light. Being full of light it becomes an influence by which others are secretly transformed.