251. The reason 'the serpent' is used to mean all evil in general and self-love in particular is that all evil has originated in sensory evidence and also factual knowledge, which are what the serpent meant first. Consequently it now means evil itself, of every kind, and in particular self-love, or hatred of the neighbour and the Lord, which is the same as self-love. Because this evil or hatred is manifold, there being many genera of it and even more species, it is referred to in the Word by means of different kinds of serpents, such as snakes, adders, asps, haemorrhes, presters or fiery serpents, flying as well as creeping serpents, and vipers.

[2] These vary according to differences of poison, which is hatred, as in Isaiah,

Rejoice not, O Philistia, all of you, that the rod which smites you has been broken, for from the serpent's root will come forth an adder, and its fruit will be a flying prester. Isaiah 14:29.

'Serpent's root' means sensory evidence and factual knowledge, 'adder' evil that is the outcome of falsity arising from these, 'flying prester' desire which is the product of self-love. Similar references appear in the following from the same Prophet,

They hatch adder's eggs, and weave spider's webs; he who eats their eggs dies, and when it is pressed out a viper is hatched. Isaiah 59:5.

The serpent mentioned here in Genesis is in the Book of Revelation called 'the great fiery-red dragon', and 'the serpent of old', and also 'the devil and satan who leads the whole world astray', Revelation 12:3, 9; 20:2. Here and elsewhere devil is never used to mean some devil who is the prince of the rest but the entire crew of evil spirits, and evil itself.