David George Ritchie,
The Philosophical Review
(1892)
“ Facts are theories. Is sunrise a fact? It is a theory, now discarded, to explain some of our sensations. The reality, we know, is not sunrise but the rotation of the earth: and yet we are in the habit of speaking as if sunrise were the reality and the rotation of the earth the theory. But if we think the matter out, we see that the reality, by which we explain, to which we refer, our sensations, is an object of thought and not of sensation at all. And I have already shown that objectivity means coherence of my thinking with that of others. ”

