The Quietist’s preoccupation, in other words, was not with sin but with nature. The Protestant, whose preoccupation was with sin, did not look for the annihilation of nature, but for the eradication cf its sin. But what the Quietist sought to be delivered from was self. It was not a purified nature he sought but a superior nature. …To the Protestant when sin is gone, nature remains — the whole of nature; sin is merely an accident to nature. To the Quietist it is only when “nature” is gone that “sin” is gone; what he is thinking of chiefly when he says “sin” is that limitation of “nature” which constitutes its essential character. There is no cure for this evil but passage into the All. -B.B. Warfield, The Mystical Perfectionism of Thomas Upham