" In forming a judgment of ourselves now," Edwards writes, we should certainly adopt that evidence which our supreme Judge will chiefly make use of when we come to stand before him at the last day…. There is not one grace of the Spirit of God, of the existence of which, in any professor of religion, Christian practice is not the most decisive evidence…. The degree in which our experience is productive of practice shows the degree in which our experience is spiritual and divine. "

― William James , The Varieties of Religious Experience