Ok, so I jumped the gun here again and I tried to paraphrase this passage about three sensations in a previous post.
This, I think, is the difference between say a snail or goldfish and a human.
Simply, the former understands its existence in a completely different way than the latter.
Do you see it?
Suppose that three sensations follow one another—first A, then B, then C. When this happens to you, you have the experience of passing through the process ABC. But note what this implies. It implies that there is something in you which stands sufficiently outside A to notice A passing away, and sufficiently outside B to notice B now beginning and coming to fill the place which A has vacated; and something which recognises itself as the same through the transition from A to B and B to C, so it can say ‘I have had the experience ABC’.