7781. 'And all the firstborn of the beasts' means adulterated forms of the good of faith. This is clear from the meaning of 'the firstborn' as faith; and from the meaning of 'beast' as affections for good, and in the contrary sense affections for evil, dealt with in 45, 46, 141, 143, 246, 714, 715, 719, 776, 2179, 2180, 3519, 4724, 5198. Such things come to be meant by 'beasts' from representatives in the next life, 3218; and for that reason also such things were meant by the ones used in sacrifices, 2180, 2805, 2807, 2870, 3519. And because 'beasts' meant these things 'the firstborn of the beasts' therefore means the good of truth, at this point when it had been adulterated since it was with the Egyptians, who perverted all truths and forms of good by applying them to evil purposes.

3218. When angels are stirred by affections and at the same time are discussing these, such things manifest themselves among spirits in the lower sphere as representative types of animals. When the discussion concerns good affections, beautiful, gentle, and useful animals emerge such as those used in sacrifices in the Divine representative worship within the Jewish Church - such as lambs, sheep, kids, she-goats, rams, he-goats, calves, young bulls, and oxen. And whatever is seen at any time on the animal represents some mental image in the angels' thought, which upright spirits are also allowed to perceive. From this one may see what was meant by the animals in the religious observances of the Jewish Church, and what by the same animals when mentioned in the Word, namely affections, 1823, 2179, 2180. But when angels' discussion is about evil affections it is represented by offensive, vicious creatures serving no use, such as tigers, bears, wolves, scorpions, serpents, rats, and so on, even as such affections are also meant by these in the Word.