Thunder voices prefaced the breaking of the four seals in John's heavenly visions, but prior to the sounding of the seven trumpets and the blaze of fire on the heavenly altar ‘there was silence in heaven'. So, silence issues forth in trumpet calls and in the angelic prayer-action at the altar alight with flame. All public worship expresses itself vocally, for only such prayer can express corporate worship and fellowship prayer; but the Catholic Church has devised a service of silence, just as she has produced Orders of Silence, and that service is Exposition of the Blessed Sacrament. The Rite begins with the O Salutaris; it ends with the Tantum ergo, but the interspace is Silence. The High Priest, Heli, was an unwise father but wise as a spiritual director, for how great was his wisdom when he bade the child Samuel respond to the voice of God with these words: ‘Speak, Lord, for thy servant heareth.’ Here is the perfect counsel for those who kneel before the Host exposed. All is silence: the Word is silent; silently the candles immolate themselves in honour of the Unseen Light; the flowers praise their Creator by their beauty and fragrance, but silent is their tribute. Silence is the soul's receptive mood; it is the ‘Speak, Lord, for thy servant heareth.’ When we say prayers, God listens to us; but when we are silent we become listeners to the voice of God.