Sense-certainty itself has thus to be asked: What is the This? If we take it in the two-fold form of its existence, as the Now and as the Here, the dialectic it has in it will take a form as intelligible as the This itself. To the question, What is the Now? we reply, for example, the Now is night-time. To test the truth of this certainty of sense, a simple experiment is all we need: write that truth down. A truth cannot lose anything by being written down, and just as little by our preserving and keeping it. If we look again at the truth we have written down, look at it now, at this noon-time, we shall have to say it has turned stale and become out of date. Hegel, Phenomenology of Spirit S. 95 Overview In philosophy, English words like "this" are referred to as indexicals, with the implication that (A) they are used to point at something and (B) what they point at is determined by context (just as, when I point at someone, who I am pointing at is determined ...