"At the beginning of his literary life Thomas Vaughan was influenced deeply by the works of Cornelius Agrippa and especially by The Three Books of Occult Philosophy. He drew much from this source, as any annotations are designed to shew; but the matter of Agrippa suffers a certain transmutation in the alembic of his own mind. The allusion in the text above is to the well-known mystical state of figurative death which is the threshold of union."