The solar systems are huge animals; the globes are lesser animals; and so forth down to the monad of molecular cohesion.

As the universe is infinite and eternal, motion, place and time do not qualify it; these are terms applicable only to the finite parts of which it is composed.

For the same reason nothing in the universe can perish.

What we call birth and death, generation and dissolution, is only the passage of the infinite, and homogeneous entity through successive phases of finite and differentiated existence; this continuous process of exchange and transformation being stimulated and sustained by attraction and repulsion, properties of the indwelling divine soul aiming at self-realization.
Having formed this conception, Bruno supported it by metaphysical demonstration, and deduced conclusions bearing on psychology, religion, ethics.

Much of his polemic was directed against the deeply-rooted notion of a finite world derived from Aristotle.