People talk about the silence of nature, but of course there is no such thing. What they mean is that OUR voices are still, OUR noises are absent.
Silence is not a thing we make; it is something into which we enter. It is always there. We talk about keeping silence. We keep only that which is precious. Silence is precious, for it is of God. In silence all God's acts are done; in silence alone can God's voice be heard, God's word spoken.