There is one quality of mind which is the basis and foundation of spiritual discovery, and that quality of mind is called bare attention. Bare attention means observing things as they are, without choosing, without comparing, without evaluating, without laying our projections and expectations on what is happening; cultivating instead a choiceless and non-interfering awareness.
In a cave, all outer sounds are smothered by rock and earth, but this makes the sounds of one's own heartbeat and breath audible. In the same way, contemplative stillness turns us away from everyday clamor but allows us to hear the subtle in our own lives. When listening not with the ear but with the spirit, one can perceive the subtle sound. By entering into that sound, we enter into supreme purity. That is why so many religious traditions pray, sing, or chant as a prelude to silence. They understand that the repetition and absorption of sound leads to sacredness itself. The deepest sound is silence. This may seem paradoxical only if we regard silence as an absence of life and its opposites. It is both sound and soundlessness, and it is in this confluence that the power of meditation emerges.