In its factical Being, any Dasein is as it already was, and it is ‘what’ it already was. It is its past, whether explicitly or not. And this is so not only in that its past is, as it were, pushing itself along ‘behind’ it, and that Dasein possesses what is past as a property which is still present-at-hand and which sometimes has after-effects upon it: Dasein ‘is’ its past in the way of its own Being, which, to put it roughly, ‘historizes’ out of its future on each occasion.
Heidegger, Being and Time
A whole is that which has a beginning, a middle and an end. A beginning is that which itself does not follow necessarily from anything else, but some second thing naturally exists or occurs after it. Conversely, an end is that which does itself naturally follow from something else, either necessarily or in general, but there is nothing else after it. A middle is that which itself comes after something else, and some other thing comes after it.
Aristotle, Poetics