Fire and wind can easily combine, so can wind and water, and it is water that falls to earth and blends with the soil to bring it the nutrients of life.
Thus the brain is the vessel of man's soul, and the fire in his soul ascends upward to grasp the Infinite.
Here the fire in the soul and the heart express themselves as joy in the performance of God's commandments, the wind as intensity and enthusiasm of action, the water as attraction and desire toward spirituality or repulsion and disgust with physicality, which all imprint themselves on the movements of his body.
Hence it is a rational soul, and this is a point of cardinal importance in connection with the Stoic ethics.
The divine fire was breathed into the first man, and thereafter passed from parent to child in the act of procreation.
After death, all souls, according to some, but only the souls of the good, according to others, continue in individual existence until the general conflagration in which they, and all else, return to God.