Why should not every individual man have existed more than once upon this world? Why should I not come back as often as I am capable of acquiring fresh knowledge? Is this hypothesis so laughable merely because it is the oldest? Because the human understanding, before the sophistries of the schools had dissipated and debilitated it, lighted upon it at once?

The education of the human race. From the Germ. [by F. W. Robertson]. (ed. 1872)