"John Swinton, who is frequently considered one of the earliest of the Quaker "mystics", may have been the person whose message greatly impressed Robert Barclay at the first meeting he attended.
This message was expressed in an oxymoron which has been passed down through the centuries:
In stillness there is fullness
In fullness there is nothingness
In nothingness there are all things "
(fn. 2 from p. xiv of Barclay's Apology in Modern English)