Beyond all doubt there was a time when there was no life upon this earth. The testimony of geology to the fact that the globe was once a ball of burning gas and molten rock, clothed about with boiling vapors, is indisputable. And we do not know how life could have existed under such conditions; that seems impossible. Geology tells us that later on a crust formed, the globe cooled and hardened, the vapors condensed and became mist or fell in rain. The cooled surface crumbled into soil; moisture accumulated, ponds and seas were gathered together, and at last somewhere in the water or on the land appeared something that was alive.  

It is reasonable to suppose that this first life was in single-celled organisms, but behind these cells was the insistent urge of Spirit, the Great One Life seeking expression. And soon organisms having too much life to express themselves with one cell had two cells and then many, and still mo re life was poured into them.