Oil -- typically olive oil -- symbolizes the good that comes from celestial love. Celestial love is love of the Lord, the highest and purest love we can have. The good of celestial love is the desire to be good springing from celestial love: Wanting to do the Lord's will because you love Him. That's not a state many reach, even in heaven, but it's a beautiful goal. This representation makes sense based on the idea that the sun -- the source of all natural light and heat, and thus all natural life -- represents the Lord, the source of all spiritual light, heat and life. Burning oil was the most pure fire available in Biblical times, thus the closest representation of the sun people could create.

28. The Son of man symbolizes the Lord in relation to the Word because prophets also were called sons of man. Prophets were also called sons of man because they represented the Lord in relation to the Word, and therefore they symbolized the doctrine of the church drawn from the Word. Prophets have no other meaning in heaven when they are mentioned in the Word. For the spiritual meaning of a prophet, as also that of the Son of man, is the doctrine of the church drawn from the Word, and when referring to the Lord it is the Word itself.

That the prophet Daniel was called son of man may be seen in Daniel 8:17.

That the prophet Ezekiel was called son of man may be seen in Ezekiel 2:1, 3, 6, 8, 3:1, 3-4, 10, 17, 25, 4:1, 16, 5:1, 6:2, 7:2, 8:5-6, 8, 12, 15, 11:2, 4, 15, 12:2-3, 9, 18, 22, 27, 13:2, 17, 14:3, 13, 15:2, 16:2, 17:2, 20:3-4, 27, 46, 21:7, 11, 14, 17, 19, 24, 22:18, 24, 23:2, 36, 24:2, 16, 25, 25:2, 26:2, 27:2, 28:2, 12, 21, 29:2, 18, 30:2, 21, 31:2, 32:2, 18, 33:2, 7, 10, 12, 24, 30, 34:2, 35:2, 36:1, 17, 37:3, 9, 11, 16, 38:2, 14, 39:1, 17, 40:4, 43:7, 10, 18, 44:5.

It is apparent now from this that the Lord in relation to His Divine humanity is called the Son of God, and in relation to the Word the Son of man.