I have held and hold souls to be immortal.... Speaking as a Catholic, they do not pass from body to body, but go to paradise, purgatory or hell. But I have reasoned deeply, and, speaking as a philosopher, since the soul is not found without body and yet is not body, it may be in one body or in another, and pass from body to body.

In space there are countless constellations, suns and planets; we see only the suns because they give light; the planets remain invisible, for they are small and dark. There are also numberless earths circling around their suns.

The beginning, middle, and end of the birth, growth, and perfection of whatever we behold is from contraries, by contraries, and to contraries; and whatever contrariety is, there is action and reaction, there is motion, diversity, multitude, and order, there are degrees, succession and vicissitude.

The universe is then one, infinite, immobile. ... It is not capable of comprehension and therefore is endless and limitless, and to that extent infinite and indeterminable, and consequently immobile.

That which we have lived is nothing; that which we live is a point; that which we have to live is not yet a point, but may be a point which, together, shall be and shall have been.

Desire urges me on, while fear bridals me.

The stars in the sky are really other suns like our own, around which orbit other planets. (paraphrase)