God is to be worshipped in spirit, in his own power and life, and this is at his own disposal. His church is a gathering in the Spirit. If any speak there, they must speak as the oracle of God, as the vessel out of which God speaks; as the trumpet out of which he gives the sound. Therefore there is to be a waiting in silence till the Spirit of the Lord move to speak, and also give words to speak. For we are not to speak our own words, or in our own wisdom or time; but the Spirit’s words, in the Spirit’s wisdom and time, which is when he moves and gives to speak. 

On the wisdom of silence from an early Quaker.