The stillness leads to silence when the consciousness is absorbed in the Self. This is Ekagrata Parinamah:
that (the soul) which has no other. The mind is stilled, the breath controlled. (Yoga Sutra III 12)
瑜伽經III 12 : 身體靜了下來心智也就靜了下來，身心完全沈浸在唯一的專注點上。 唯一的當下，無它。所以呼吸和思緒也跟著進入禪的境界。