"There are those who see a great mystery in the presence of eternal values in a moving and animal world, and think to solve that dualism, as they call it, by denying that nature can have spiritual functions and spirit a natural cause; but nothing can be simpler if we make, as we should, existence the test of possibility. Ab esse ad posse valet illatio. Nature is a perfect garden of ideals, and passion is the perpetual and fertile soil for poetry, myth, and speculation."