Oil
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.
Psalms 132:6-10
6
Behold, we heard of it in Ephrathah. We found it in the field of Jaar:
7
"We will go into his dwelling place. We will worship at his footstool.
8
Arise, Yahweh, into your resting place; you, and the ark of your strength.
9
Let your priest be clothed with righteousness. Let your saints shout for joy!"
10
For your servant David's sake, don't turn away the face of your anointed one.
