"All evolution consists of an evolving life, passing from form to form as it evolves, and storing up in itself the experiences gained through the forms; the reincarnation of the human soul is not the introduction of a new principle into evolution, but the adaptation of the universal principle to meet the conditions rendered necessary by the individualisation of the continuously evolving life... A life of extreme hardship, of ceaseless struggle with nature, will develop very different powers from those evolved amid the luxuriant plenty of a tropical island; both sets of powers are needed, for the soul is to conquer every region of nature, but striking differences may thus be evolved even in souls of the same age, and one may appear to be more advanced than the other, according as the observer estimates most highly the more “practical” or the more “contemplative” powers of the soul, the active outward-going energies, or the quiet inward-turned musing faculties. The perfected soul possesses all, but the soul in the making must develop them successively, and thus arises another cause of the immense variety found among human beings. For again, it must be remembered that human evolution is individual. p.180-202"