Silent worship - From Faith and Practice (2018 edition):

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"[Early Friends] made the discovery that silence is one of the best preparations for communion [with God] and for the reception of inspiration and guidance. 

Silence itself, of course, has no magic. It may be just sheer emptiness, absence of words or noise or music.... But it may be an intensified pause, a vitalized hush, a creative quiet, an actual moment of mutual and reciprocal correspondence with God." 

--Rufus M. Jones, Spiritual Message of  the Religious Society of Friends, 1937