Full Idea
In the case of a quantity that has a beginning, a middle and an end, there are those instances in which the order does not create a differentia, which are said to be 'sums', and those is which it does, which are said to be 'wholes'.
Gist of Idea
A 'whole' (rather than a mere 'sum') requires an internal order which distinguishes it
Source
Aristotle (Metaphysics [c.324 BCE], 1024a01-5)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.146
A Reaction
This is the reason why Aristotle is so much better than the run-of-the-mill naïve modern metaphysician.