Many religions suggest that love, light, and life are characteristics of God and the cosmos.
Most say that light and heat come from divine fire as light and heat come from stars.
But I would say that the attractive power which creates the light and heat is love.
The three main centers in the body are the heart, the mind, and the sex. Love, light, and life.
Most people look at this vertically placing the sex at the bottom (lower nature) the heart in the center (middle nature) and the mind at the top (higher nature).
I would suggest that we should look at this differently with the mind and sex as the outer manifestations of the heart which is the deeper nature. The soul or divine spark is located in the heart not in the mind.
Because our eyes are in our head we assume that the self or the soul is in our mind. This is an optical illusion. If we are honest we will know that our heart is closer to ourselves than our mind or our sex.
Sex is the consummation of love. The energy and the blood come from the heart.
What we think comes from the heart. The mind is like a tool with which we hone our ideas.
The true self is in the heart.