I am aware of course that modern science will regard this as nonsense, but it is none the less true — man as he is today cannot possibly exist six thousand years hence, any more than it is possible for a man who is now twenty years old to be alive in two hundred years time. We can discover through occult investigation that in the sixth millennium women as they are constituted today will become sterile and that an entirely different reproductive process will exist by that time. I realize that this will sound the purest nonsense to those who think along the lines of modern science; nevertheless the fact is undeniable.
Source: Rudolf Steiner – GA 175 – Building Stones for an Understanding of the Mystery of Golgotha: Lecture 3 – Berlin, 10th April 1917
Translated by A. H. Parker