6273. 'For Manasseh was the firstborn' means since good does indeed occupy the first place. This is clear from the representation of 'Manasseh' as good belonging to the will, dealt with before; and from the meaning of 'the birthright' as the prior and higher position, dealt with in 3325, so that 'the firstborn' is the one who occupies the first place. Is anyone incapable of seeing from natural light alone, provided a superior light brightens it a little, that good occupies the first place, as also do the intentions in a person's will, and that truth occupies the second, as also do the thoughts in his mind? Is anyone also incapable of seeing that the intentions in a person's will cause him to think in one particular way and no other, consequently that the good he possesses causes him to think that this or that is true; so that truth occupies the second place and good the first? Think and reflect on whether truth that composes faith can take root anywhere else than in good, or whether faith other than that which has taken root there is faith. From this you will be able to decide which is the primary or essential element for the Church, that is, for the person in whom the Church exists.

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.