"Thus far Mrs. Kingsford's idea that the human Ego is being reincarnated in several successive human bodies is the true one... After circling, so to say, along the arc of the cycle, circling along and within it (the daily and yearly rotation of the Earth is as good an illustration as any) when the Spirit-man reaches our planet, which is one of the lowest, having lost at every station some of the etherial and acquired an increase of material nature, both spirit and matter have become pretty much equilibrized in him. But... in the process of involution and evolution downward, matter is ever striving to stifle spirit, when arrived to the lowest point of his pilgrimage, the once pure Planetary Spirit will be found dwindled to — what Science agrees to call a primitive or Primordial man... At that point the great Law begins its work of selection. Matter found entirely divorced from spirit is thrown over into the still lower worlds... matter ground over in the workshop of nature proceeds soulless back to its Mother Fount; while the Egos purified of their dross are enabled to resume their progress... the laggard Egos perish by the millions. It is the solemn moment of the survival of the fittest the annihilation of those unfit."