Lucifer (n.) means light-bringer, and Mercurius as the shimmering planet near the sun at dawn or dusk is one, heralding the coming of light; Mylius said that if Mercurius were purified, Lucifer would fall from heaven.
Lucifer (n.) may have understood God's will to create better than anyone and carried it out most faithfully: by rebelling, he became creation's own counter-will.
Lucifer (n.) counterbalances the Son: the act of love embodied in Christ is weighed against Lucifer's denial, and only that contrast lets the One become definite.
Lucifer (n.) is Satan as teacher: while he led man into wickedness, his angels taught him the arts and sciences.
Mephisto (n.) gets the best lines in every version of the story, which is how he gets the soul too.
Mephisto (n.) is a free trial that auto-renews into your soul.
Mephisto (n.) is the devil who does paperwork
Mephisto (n.) never persuades anybody, he only writes down what they already wanted.
Satan (n.) is not a product of rational thinking; for two thousand years he has been a constant expression of the psyche, born of the unconscious evolution of metaphysical images.
Satan (n.) was banished from the heavenly court yet kept his dominion over the sublunary world — cast not into hell but upon earth.
Satan (n.) made better use of God's omniscience than his father did, and with good reason was later named Lucifer.
Satan (n.) is the father of all tricksters — yet Yahweh always looks for the cause of creation's taint in disobedient man, never in his son.
Satanaël (n.) was, for the Euchites, God's first son, Christ being the second; Mercurius, as the elder brother of Christ, echoes this idea.