In creating the world, God used arithmetic, geometry, and likewise astronomy.

If, therefore, man has come into the world to search for God and, if he has found Him, to adhere to Him and to find repose in adhering to Him-man cannot search for Him and attain Him in this sensible and corporeal world, since God is spirit rather than body, and cannot be attained in intellectual abstraction, since one is able to conceive nothing similar to God, as he asserts-how can one, therefore, search for Him in order to find Him?

The world has no circumference. It would certainly have a circumference if it had a centre, in which case it would contain within itself its own beginning and end; and that would mean that there was some other thing which imposed a limit to the world - another being existing in space outside the world. All of these conclusions are false. Since, then, the world cannot be enclosed within a material circumference and centre, it is unintelligible without God as its centre and circumference.

An external thing that is knowable [is knowable] by means of something internal that is consubstantial [with the rational soul].

With the senses man measures perceptible things, with the intellect he measures intelligible things, and he attains unto supra-intelligible things transcendently.

When Eternity is considered to be the Beginning, then our speaking of the Beginning of the Begun is nothing but our speaking of the Eternity of the Eternal or our speaking of the Eternity of the Begun.

Just as all motion is from an unmovable cause, so everything divisible is from an indivisible cause. However, this visible, corporeal world is, assuredly, of a divisible nature, since what is corporeal is divisible. Therefore, this world is from an earlier, indivisible Cause.