251. The reason why the “serpent” means all evil in general, and specifically the love of self, is that all evil has had its rise from that sensuous part of the mind, and also from that memory-knowledge [scientifico], which at first were signified by the “serpent;” and therefore it here denotes evil of every kind, and specifically the love of self, or hatred against the neighbor and the Lord, which is the same thing. As this evil or hatred was various, consisting of numerous genera and still more numerous species, it is described in the Word by various kinds of serpents, as “snakes” “cockatrices” “asps” “adders” “fiery serpents” “serpents that fly” and “that creep” and “vipers” according to the differences of the poison, which is hatred. Thus we read in Isaiah:

Rejoice not thou, whole Philistia, because the rod which smiteth thee is broken, for out of the serpent’s root shall go forth a cockatrice, and his fruit shall be a flying fire-serpent (Isaiah 14:29).The “serpent’s root” denotes that part of the mind, or that principle, which is connected with the senses and with memory-knowledge [est sensuale et scientificum]; the “cockatrice” denotes evil originating in the falsity thence derived; and the “flying fire-serpent” the cupidity that comes from the love of self. By the same Prophet also similar things are elsewhere thus described:

They hatch cockatrice’s eggs, and weave the spider’s web; he that eateth of their eggs dieth, and when it is crushed there cometh out a viper (Isaiah 59:5).

The serpent described here in Genesis is called in the Revelation the “great and red dragon” and the “old serpent” and also the “devil and satan” that “deceives the whole world” (Revelation 12:3, 9; 20:2), where, and also in other places, by the “devil” is not meant any particular devil who is prince over the others, but the whole crew of evil spirits, and evil itself.

2083. 'And you will call his name Isaac' means the Divine Rational. This is clear from Isaac's representation and also from the meaning of his name in the internal sense.

From Isaac's representation: As stated frequently already, 'Abraham' represents the Lord's Internal Man, 'Isaac' His Rational Man, and 'Jacob' His Natural Man. The Lord's Internal Man was Jehovah Himself. Because the Rational Man was conceived from the influx of the Internal Man into the External Man's affection for knowledge, 1896, 1902, 1910, it originated in the Divine thus joined to the Human. Consequently the first rational represented by 'Ishmael' was human, but it was made Divine by the Lord, and is then represented by 'Isaac'.

From the meaning of his name: He was given the name Isaac from the word for 'laughter', and because laughter in the internal sense means the affection for truth, which belongs to the rational, as shown above in 2072, Isaac accordingly here means the Divine Rational.

[2] From His own power the Lord made Divine everything that was human with Him. Thus He made not only the rational Divine but also the sensory part, interior and exterior, and so the body itself. In this way He united the Human to the Divine. It has been shown already that not only the rational, but also the sensory part, and so the whole body also was made Divine and Jehovah. This may also become clear to anyone from the fact that He alone has risen as to the body from the dead, and sits at the right hand of the Divine Power both with His entire Divine and with His entire Human. 'Sitting at the right hand of Divine power' means having all power in heaven and on earth.