Larger context for LACK in Corpus USbrown_UKbncw/US_brown.txt DBL-CLICK WDS FOR DEF
Now what is perfect motion?
It must, apparently, be motion without termini.
Because motion which begins and ends at discrete places would (e.g. for Aristotle) be incomplete.
Circular motion, however, since it is eternal and perfectly continuous, lacks termini.
It is never motion towards something.
Only imcomplete, imperfect things move towards what they LACK. Perfect, complete entities, if they move at all, do not move towards what they LACK.
They move only in accordance with what is in their natures.
Thus, circular motion is itself one of the essential characteristics of completely perfect celestial existence.
