Full Idea
It is manifest that if time were not, the now would not be either, and if the now were not, time would not be.
Gist of Idea
The present moment is obviously a necessary feature of time
Source
Aristotle (Physics [c.337 BCE], 219b33)
Book Reference
Aristotle: 'Physics Books III and IV', ed/tr. Hussey,Edward [OUP 1983], p.45
A Reaction
I take this to be Aristotle's commitment to the A-series view, which needs a moving present moment. Despite Einstein and B-series eternalism, I remain in agreement with Aristotle. B-series fans struggle like theologians to explain 'now'.