In reasoning from this concept as a starting-point, he formed opinions upon problems of theology, ontology, biology and psychology, which placed him out of harmony with medaeival thought, and in agreement with the thought of our own time.

Why this was so, can easily be explained.

Bruno, first of all philosophers, adapted science, in the modern sense of that term, to metaphysic.

He was the first to perceive that a revolution in our conception of the material universe, so momentous as that effected by Copernicus, necessitated a new theology and a new philosophical method.
Man had ceased to be the center of all things; this globe was no longer 'the hub of the universe,' but a small speck floating on infinity.

The Christian scheme of the Fall and the Redemption, if not absolutely incompatible with the new cosmology was rendered by it less conceivable in any literal sense.