The third stage she titles "Illumination" and quotes William Law: Everything in ..nature, is descended out that which is eternal, and stands as a..visible outbirth of it, so when we know how to separate out the grossness, death, and darkness..from it, we find..it in its eternal state.
Where Underhill struck new ground was in her insistence that this state of union produced a glorious and fruitful creativeness, so that the mystic who attains this final perfectness is the most active doer - not the reclusive dreaming lover of God.