4277. 'And he touched the hollow of his thigh' means where celestial-spiritual good is joined to natural good meant by 'Jacob'. This is clear from the meaning of 'the thigh' as conjugial love, and consequently as all celestial and spiritual love, since these are derived from conjugial love as offspring from their parent, dealt with in 3021; and from the meaning of 'the hollow' or socket or cavity of it - that is to say, of the thigh - as the place where the joining together exists, and here therefore where celestial-spiritual good is joined to natural good meant by 'Jacob'. But no one can be told anything about that conjunction unless he knows first of all what celestial-spiritual good, meant by 'Israel', is, and what natural good, meant by 'Jacob', is. It will be told below at verse 28 where Jacob, who at that point is named Israel, is the subject and also further on where Jacob's descendants are the subject.

6314. As it is with light, so it is with the heat that is vital to a person's existence. In no way at all does that vital heat originate in the heat radiated by the sun in the world; rather, it originates in spiritual heat, which is love and radiates from the Lord. This heat is what angels have. Consequently the amount of vital heat a person has is determined by the amount of love he has. His body however is warmed by worldly heat, as is his sensory awareness within it; yet vital heat flows into that worldly heat and imparts life to it. Differences in the purity and intensity of this heat are akin to variations in the clarity of the light. This vital heat is what one should understand by the holy fires mentioned in the Word, and therefore heavenly loves are meant by those fires. But in a contrary sense that worldly heat is what one should understand by the fires of hell, and therefore hellish loves and the desires that go with them are meant when these fires are mentioned in the Word.