 The priests were given a strict instruction concerning the fire upon the altar. Meanwhile, the fire on the altar must be kept burning. It must never go out. They were called to steward the fire, but they weren't the ones who started the fire. Fire blazed forth from the Lord's presence and consumed the burnt offering and the fat on the altar. God himself started the flame that the priests were instructed to preserve. Like the fire upon the altar, a move of the Holy Spirit cannot be started by man, but it can be stewarded. There's not a single action one can take. No method one can apply to bring about to move of God. It's just the power of the Holy Spirit. He chooses where and when to move. He watches to see who has truly laid an altar before him. He searches for an offering, a sacrifice, a surrendered life to consume.