Library Plotinus Ennead III.7: Time and Eternity
Chapter 11
§10
10. Time, again, has been described as some sort of a sequence upon Movement, but we learn nothing from this, nothing is said, until we know what it is that produces this sequential thing: probably the cause and not the result would turn out to be Time.
And, admitting such a thing, there would still remain the question whether it came into being before the movement, with it, or after it; and, whether we say before or with or after, we are speaking of order in Time: and thus our definition is "Time is a sequence upon movement in Time!"
Enough: Our main purpose is to show what Time is, not to refute false definition. To traverse point by point the many opinions of our many predecessors would mean a history rather than an identification; we have treated the various theories as fully as is possible in a cursory review: and, notice, that which makes Time the Measure of the All-Movement is refuted by our entire discussion and, especially, by the observations upon the Measurement of Movement in general, for all the argument- except, of course, that from irregularity- applies to the All as much as to particular Movement.
We are, thus, at the stage where we are to state what Time really is.
English translation by Stephen MacKenna and B. S. Page. Public domain. Digital text via the Internet Classics Archive.