Can one speak of God’s silence? And if so, how should one interpret such a silence?
Yes, in a certain sense God is silent, because He has already revealed everything. He spoke “in ancient times” through the Prophets and “in these last days” through His Son (cf. Heb 1:1-2). In the Son He said all that He had to say. Saint John of the Cross says that Chris is “like an abundant mine with many recesses of treasures, so that however deep individuals may go they never reach the end or bottom, but rather in every recess find new veins with new riches everywhere” (Spiritual Canticle 37.4). We need then to listen once more to the voice of God who speaks in human history. And if His word is not heard, perhaps it is because “the ears” of our hearts are not open to it. In this sense Christ spoke of those who “look but do not see and hear but do not listen or understand” (cf. Mt 13:13), while the experience of God is always within every man’s reach, accessible to him in Jesus Christ and in the power of the Holy Spirit.
—from Crossing the Threshold of Hope by Pope John Paul II, in the chapter: Was God at Work in the Fall of Communism?