In every science certain things must be accepted as first principles if the subject matter is to be understood; and these first postulates rest upon faith.

Thou art merciful; when all my endeavour is turned toward Thee because all Thy endeavour is turned toward me; when I look unto Thee alone with all my attention, nor ever turn aside the eyes of my mind, because Thou dost enfold me with Thy constant regard; when I direct my love toward Thee alone because Thou, who art Love's self, hast turned Thee toward me alone. And what, Lord, is my life, save that embrace wherein Thy delightsome sweetness doth so lovingly enfold me?

The rational is apprehended through the intellect, however, the intellect is not found in the region of the rational; the intellect is as the eye and the rational as the colors.

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

Nor is the darkness of colour a proof of the earth's baseness; for the brightness of the sun, which is visible to us, would not be perceived by anyone who might be in the sun.

Therefore, in the Beginning, which is Truth, all things are Eternal Truth itself

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