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.

736. As for Noah, or the member of this new Church, he was such that he believed with simplicity those things which he had come to possess from the Most Ancient Church. These were items of doctrine that had been gathered together and converted into a kind of doctrinal form by those called Enoch. The disposition of the people meant by Noah however was entirely different from those before the Flood who perished, called the Nephilim. For they immersed doctrinal matters concerning faith in their own filthy desires and in this way strove after dreadful persuasions from which they were unwilling to draw back even though they were taught by others and were shown that these were falsities. This dual genius or disposition also exists among people today. The former can be regenerated easily, but the latter with difficulty.