It was obvious to Aristotle that most things which move do so because some other moving object impels them. A hand, itself in motion, moves a sword; a wind, itself in motion, moves a ship. But it was also fundamental to his thought that no infinite series can be actual. We cannot therefore go on explaining one movement by another ad infinitum. There must be in the last resort something which, motionless itself, initiates the motion of all other things. Such a Prime Mover he finds in the wholly transcendent and immaterial God who 'occupies no place and is not affected by time'. But we must not imagine Him moving things by any positive action, for that would be to attribute some kind of motion to Himself and we should then not have reached an utterly unmoving Mover. How then does He move things? Aristotle answers [Greek here], 'He moves as beloved'. He moves other things, that is, as an object of desire moves those who desire it. The Primum Mobile is moved by its love for God, and being moved, communicates motion to the rest of the universe. [ch.V.c]

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