Key words, shifters, such as 'here' (and 'there') and 'now' (and 'then') and 'I' (or 'me' or 'he' or 'she'); what do we do when we use them? There is a remarkable distinction, as pointed out, between their use with reference to the worlds called external and internal. In the external world here and there are interchangable depending on where we place ourselves, but in the inner world here is absolutely fixed and there is everything but. Similarly in the external world now is a point on a continuum and it takes the place of a future then before passing into a past then, while in the internal world there is only ever the same now. Again, the external 'I' or 'me' is an evolving project of learning 'who I am' which passes through various cruxes, gaining as much as it loses as it goes, being proved, tested, affiliated, burdened, freed etc., while internally it is only ever one thing, of which it is sometimes observed that it is as it is identically at each stage in relation to the evolving external life. In the inner world here, now and I all refer to the same nameless reality, which is the source of every other claimed reality, and this reality is in no sense an idea. In the external world reality is determined by latent metaphysical ideas of causation and power of determination, it alters and is subject to ongoing inquiry. The internal reality plays no causal role, you cannot board it as you would a vehicle because you already are it. You cannot think it nor can you doubt it, but all the categories you bring to bear from the ideal external life fall short without making the least impression.