definite

And her circumference is like the circumference of the heaven, and her chariot in which she rides is driven by the wind, and light is given to her in (definite) measure.

In the circumference of the sun there are seven portions of light which are added to it more than to the moon, and in definite measures it is s transferred till the seventh portion of the sun is exhausted.

And the shepherds and their associates delivered over those sheep to all the wild beasts, to devour them, and each one of them received in his time a definite number: it was written by the other in a book how many each one of them destroyed of them.

It is by this means, by taking up into itself the noblest elements, that the soul is established in purity, and having fixed its aim on piety, the noblest goal of all, it uses this as its infallible guide and so acquires a definite purpose.