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.
The discipline of silence doesn't mean just taking a short vacation from the spoken word. It also means giving complete relaxation to the muscles, the tissues, the tongue itself. A modern writer once said: "Knowledge has never been known to enter the head via an open mouth." It is when you become completely silent that you are able to absorb knowledge. God speaks in silence. The discipline of silence is essential on the path.