The 'sun' in the Word, when referring to the Lord, signifies His divine love and wisdom. Because the sun represents the Lord, with respect to His divine love wisdom, since ancient times even to the present day, worship is done and temples are built facing the rising sun. The sun signifies celestial and spiritual love and also the Lord regarding His divine love, and so the good of love from Him. In the opposite sense, it signifies a denial of the Lord's divinity, and so adulteration of the good of love.

In Genesis 15:12, 19:23, this signifies the time and state before consummation; for the sun signifies the Lord, and the celestial things of love and charity; so its setting represents the last time of the church. Its rising signifies a coming of the Lord, and the first period of a new church. (Arcana Coelestia 1837, 1859)

In Jeremiah 8:1, this signifies self-love and its lusts. (Arcana Coelestia 2441)

In Revelation 12:1, this signifies love. (Arcana Coelestia 253, Arcana Coelestia 3272[2])

Sun signifies the good of love. (Arcana Coelestia 4918[3]）

(Odkazy: Apocalypse Explained 709)

7542. 'Onto your heart' means into what is inmost. This is clear from the meaning of 'heart' as that which belongs to a person's will, thus to his love, dealt with in 2930, 3317, 3888, 3889, consequently what is central to the actual life within him; for his love, belonging intrinsically to his will, constitutes that life within him. This is why 'heart' means what is inmost. What is inmost in the case of the good is love to the Lord and love towards the neighbour, whereas what is inmost in the case of the evil is self-love and love of the world. The latter is what is meant here; and what is around it, constituting so to speak the surrounding parts, are the evils and falsities that lend support, arranged into order according to the ways in which they support it. In the next life they are brought out into the open in the order in which they have been arranged. First to come forth are those that occupy the outermost surrounding parts, then those that lie further in; and finally what is inmost is revealed. So it is that a person in the next life passes through a large number of states, and that the evil are afflicted in successive stages by scourges or plagues before they are cast into hell, as accords with what has been stated immediately above. What is inmost, which they come to last of all, is hell itself residing with them, for it is the evil that had been central to their love, and so the end which they held in view in everything they did and which in the world they had kept deeply hidden within them.