"Narrowing down our view to the chain of which our globe is one, we see life-waves sweep round informing the kingdoms of nature, the three elemental, the mineral, vegetable, animal, human. Narrowing down our view still further to our own globe and its surroundings, we watch human evolution, and see man developing self-consciousness by a series of many life-periods; then centering on a single man we trace his growth and see that each life-period has a threefold division that each is linked to all life-periods behind it reaping their results, and to all life-periods before it sowing their harvests, by a law that cannot be broken; that thus man may climb upwards with each life-period adding to his experience, each life-period lifting him higher in purity, in devotion, in intellect, in power of usefulness, until at last he stands where They stand who are now the Teachers, fit, to pay to his younger brothers the debt he owes to Them. p. 39"