6398. 'Dan will be a serpent on the road' means their reasoning regarding truth, since good does not as yet lead them. This is clear from the representation of 'Dan' as those guided by truth but not as yet by good, dealt with above in 6396; from the meaning of 'a serpent' as reasoning based on sensory evidence, dealt with below; and from the meaning of 'the road' as truth, dealt with in 627, 2733. Thus 'Dan is a serpent on the road' means their reasoning regarding truth, since good does not as yet lead them. The nature of that reasoning and the nature of the truth resulting from it will be stated below.

[2] The reason why 'a serpent' means reasoning based on sensory evidence is that the interiors of a person are represented in heaven by living creatures of various kinds, and therefore in the Word similar things are meant by those same creatures. A person's sensory powers have come to be represented by serpents because they are the lowest of his mental powers. Compared with other mental powers those of the senses are on the ground so to speak, crawling around there, as may also be recognized from the forms that sensory impressions adopt when they enter in, which will in the Lord's Divine mercy be dealt with elsewhere. This explains why those sensory powers have come to be represented by 'serpents', so much so that the Lord's Divine sensory perception was represented by the bronze serpent in the wilderness, 4211 (end).

[3] True shrewdness and circumspection - qualities that reveal themselves in external affairs - were also meant by 'serpents', in Matthew,

Be shrewd as serpents and simple as doves. Matthew 10:16.

But in the case of a person who is governed by his senses and is far removed from what is internal - as those people are who are guided by truth but not as yet by good - and who speaks as his senses tell him, 'a serpent' means false reasoning. This therefore is why here, where Dan is the subject, reasoning regarding truth because good does not as yet lead him is meant. In other contexts ill-will, deceitfulness, and trickery are also meant by 'serpents', though in those places they are poisonous serpents - such as vipers and the like - whose reasoning is their poison.

'A serpent' is reasoning based on sensory evidence, see 195-197.

'A serpent' is all evil in general, and evils are distinguished from one another by different kinds of serpents, 251, 254, 257.

195. The most ancient people did not compare all things in man to beasts and birds but actually called them such. This was their manner of speaking, which also remained throughout in the Ancient Church after the Flood; and a similar manner of speaking was preserved among the Prophets. Man's sensory powers they called serpents, for just as serpents are next to the ground so do the sensory powers come next to the body. Consequently reasonings based on sensory evidence concerning mysteries of faith they called serpent-poisons, and those who reasoned in that way they called serpents. And it is their basing reasonings so much on sensory evidence - that is, on visual, as is the evidence of earthly, bodily, worldly, and natural objects - that is the reason for the statement 'the serpent was subtle, more than every wild animal of the field'.

[2] A similar usage occurs in David,

They make their tongue sharp, like a serpent. Under their lips is the poison of an asp. Psalms 140:3-5.

This refers to people who mislead a person by means of reasonings. In the same author,

They go astray even from the womb, in uttering what is untrue; their poison is like serpent's poison; they are like the poisonous deaf-adder which stops up its ear to the sound of those whispering [to it], of the wise one who belongs to the fraternity [of charmers]. Psalms 58:3-5.

Reasonings whose nature is such that those who resort to them do not even hear that which is wise, that is, do not hear 'the sound of the wise one', are here called 'serpent's poison'. This was the origin of the popular saying with the ancients about 'the serpent stopping its ear'. In Amos,

As if someone went into the house and leaned with his hand against the wall, and a serpent bit him. Is not the day of Jehovah darkness and not light, and thick darkness, and no brightness in it? Amos 5:19-20.

'His hand against the wall' stands for power that is one's own and trust in sensory evidence, which results in the benightedness described here.

[3] In Jeremiah,

The sound of Egypt will go forth like a serpent, for [her enemies] will go forth in force, and they will come to her with axes, like woodcutters. Let them cut down her forest, says Jehovah, for it will not be explored; they are more numerous than locusts, they are without number. The daughter of Egypt has been put to shame; she will be given into the hand of a people from the north. Jeremiah 46:20, 22-24.

'Egypt' stands for reasoning about Divine matters that is based on sensory evidence and factual knowledge. Reasonings are called 'the sound of a serpent', and the benightedness that results is meant by 'a people from the north'. In Job,

He will suck the poison of asps, the tongue of a viper will kill him; he will not see the brooks, the streams flowing with honey and butter. Job 20:16-17.

'Streams of honey and butter' are spiritual and celestial things, which reasoners will not see. Reasonings are called 'the poison of asps and 'the tongue of a viper'. For more concerning the serpent, see at verses 14-15, below.