What is the human soul? A portion of the mighty soul of the world, a spark of the divine spirit, an immortal monad. Still, though its possible future opens out into the unfathomable splendours of divine consciousness, its mysterious dawn dates back to the origin of organized matter. To become what it is in present-day humanity, it must have passed through all the reigns of nature, the whole scale of beings gradually developing through a series of innumerable existences. The spirit which fashions the worlds and condenses cosmic matter into enormous masses manifests itself with varying intensity and an ever greater concentration in the successive reigns of nature. A blind and confused force in the mineral, individualized in the plant, polarized in the sensations and instincts of animals, it stretches towards the conscious monad in this slow elaboration; and the elementary monad is visible in the most inferior of animals. The animal and spiritual element accordingly exists in every kingdom, though only in infinitesimal quantities in the lower kingdoms. The souls which exist in the state of germs in the lower kingdoms stay there without moving away for immense periods of time, and it is only after great cosmic revolutions that, in changing planets, they pass to a higher reign. All they can do during a planet’s period of life is to mount a few degrees. Where does the monad begin? As well ask at what hour a nebula was formed or a sun shone for the first time. Anyhow, what constitutes the essence of any man must have evolved for millions of years through a chain of lower planets and kingdoms, keeping through all these existences an individual principle which follows it everywhere. This obscure but indestructible individuality constitutes the divine seal of the monad in which God wills to manifest himself through consciousness.