... Revelation cannot be pocketed like a book one carries around. It is a living reality which calls for the living man as the location of its presence. In view of what has been said, we may, therefore, affirm that revelation goes beyond the fact of scripture in two respects: as a reality deriving from God it always extends upwards into God’s action; as a reality which makes itself known to man in faith, it also extends beyond the fact of scripture which serves to mediate it. This non-coincidence of scripture and revelation makes it clear that quite apart from the question whether scripture is the sole material source or not, there can never really, properly speaking, be a sola scriptura in regard to Christianity. ...I want to say this reminds me of my recent readings on the Quakers. The written word proceeds from the Spirit and is thus secondary to it. The Spirit is a wordless Word.
Though there is an older tradition of something similar that preceded the Quakers. And that's Christian mysticism, which existed in the medieval Roman Catholic Church. Thinkers like Meister Eckhart and closer to today Thomas Merton.