fire
Essentially as symbol of God's holiness. As such it expresses God in three ways:
1. In judgment upon that which His holiness utterly condemns (for example) (Genesis 19:24); (Mark 9:43-48); (Revelation 20:15).
2. In the manifestation of Himself, and of that which He approves (Exodus 3:2); (1 Peter 1:7); (Exodus 13:21); and ...
3. In purification (e.g) (1 Corinthians 3:12-14); (Malachi 3:2); (Malachi 3:3). So, in Leviticus, the fire which only manifests the sweet savour of the burnt-, meal-, and peace-offerings, wholly consumes the sin-offering.
fat
That which burns most quickly - devotedness, zeal.