'Must' or 'new wine' can, depending on the context, denote evil produced by falsity, or truth derived from the good of charity.

(Odkazy: Arcana Coelestia 2465)

3567. 'He said, Are you my very son Esau? And he said, I am' means a state of affection for natural truth, in that at that point it believed itself to be natural good because of its outward form. This becomes clear from Isaac's question, 'Are you my very son Esau?' which can have no other meaning in the internal sense than the influx of the rational from good into natural truth represented by Jacob, and from the reply 'he said, I am' as believing itself at that point to be good - see what has been stated above in 3550.