The Torah, “Leviticus” (Tzav), 6:1-6:2: “And the Lord spoke to Moses, saying, Command Aaron and his sons, saying, This is the law of the burnt-offering: That is the burnt offering which burns on the altar all night until morning, and the fire of the altar shall burn with it.”
An altar refers to the feelings and the desires that a person can correct from hatred to love. The correction is done at night in the dark when a person doesn’t see any self-benefit, since otherwise such actions would not be in order to bestow focused on the connection with others.
So we work in the dark until dawn. This means that we don’t feel the Light, the beginning of a new day, unless our desires are corrected.
The fire that burns all the incorrect egoistic intentions has to burn until the morning, until we change all our desires to altruism and begin to feel the Upper Light called morning, according to the law of equivalence of form.
Question: What is the meaning of “on the altar all night until morning, and the fire of the altar shall burn with it?”
Answer: This work never ends. The most correct state is the feeling of both day and night, as it is written: “Here is the day for you and here is the night too.”
The Torah tells us that in the future there will be no night. When all our egoistic intentions burn and only the desires with altruistic intentions of in order to bestow are left, then we will begin to feel only daytime.
From KabTV’s “Secrets of the Eternal Book” 12/6/13