From The Imaginative Conservative
By Siobhan Nash-Marshall
That which is posited to be moved by itself is moved primarily—Hoc quod a seipso ponitur moveri, est primo motum.
That which is posited to be put in motion by itself is put in motion principally.
Therefore, if one of its parts is at rest [that is, if one of the parts of the thing “put into motion” or also that “puts into motion” (since the definition posits that they are one and the same thing) is at rest] it follows that the whole [of that thing “put into motion” or that “puts into motion”] is at rest.—Ergo ad quietem unius partis eius, sequitur quies totius.
For if, while one part is at rest, another of its parts were put in motion, the whole itself would not be moved principally, but its part which is put in motion while the remainder is at rest.—Si enim, quiescente una parte, alia pars eius moveretur, tunc ipsum totum non esset primo motum, sed pars eius quae movetur alia quiescente.
Nothing [including a part of a thing] that is at rest while another [including one of its parts] is at rest is put into motion by itself: for that which is at rest as a result of another thing being at rest must be put into motion as a result of the other’s motion. And hence it is not moved by itself. Hence that which was stated to be put into motion by itself is not put into motion by itself. Therefore, whatever is in motion must be moved by another—Nihil autem quod quiescit quiescente alio, movetur a seipso: cuius enim quies ad quietem sequitur alterius, oportet quod motus ad motum alterius sequatur; et sic non movetur a seipso. Ergo hoc quod ponebatur a seipso moveri, non movetur a seipso. Necesse est ergo omne quod movetur, ab alio moveri.
with a divisible thing, being put into motion depends on its parts, as does its existence, so that it cannot move itself principally and of itself—moveri autem ipsius divisibilis, sicut et eius esse, dependet a partibus; et sic non potest seipsum movere primo et per se.Siobhan Nash-Marshall holds the Mary T. Clark Chair of Christian Philosophy at Manhattanville College. Author of many academic books and articles on metaphysics and the problem of evil, she has also written books and articles for a general readership. In recent years, she has devoted her attention to genocide and genocide negationism. Her most recent book, (New York: Herder&Herder, 2018) is her first book-length treatment of the topic. After the breakout of the war in Syria, she and some friends founded CINF USA, through which they attempt to help the ancient Christian cultures of the world which are presently in peril.