When did humans first appear on Earth?

The world in which we live is still at the beginning of its history though it is many millions of years older than most of us have any idea or suspect. Man appeared on this planet only yesterday and tomorrow man will have disappeared, for the successor of this very remarkable species is on its way. There are some who think that in man physical Nature has reached her highest point and that nothing superior to man is to be expected—or is possible. But in this—the successor to the human species being on its way—they are mistaken.

Fragments of Spiritual Knowledge Pertaining to the Spiritual World