Good theories of the mind must span at least three different scales of time: slow, for the billions of years in which our brains have survivied; fast, for the fleeting weeks and months of childhood; and in between, the centuries of growth of our ideas through history.
If we live with possibilities we are exiles from the present which is given us by God to be our own, homeless and displaced in a future or a past which are not ours because they are always beyond our reach. The present is our right place, and we can lay hands on whatever it offers us.