- For as we have seen that the doctrine of the relativity of knowledge precludes us from asserting, or even from inferring, that beyond the region of the Knowable Mind does not exist, it remains logically possible to institute a metaphysical hypothesis that beyond this region of the Knowable Mind does exist. - "A Candid Examination of Theism", George John Romanes.
- The " one experience," in which, according to him, we find a place for any fact which we conceive as knowable at all, is defined by Kant as a virtual insight, not, so to speak, a live and concrete consciousness. - "The Sources Of Religious Insight", Josiah Royce.
- He ranked himself with those who, " while seeking scientific knowledge for its proximate value, have an ever- increasing consciousness of its ultimate value as a transfiguration of things, which, marvellous enough within the limits of the knowable, suggests a profounder marvel than can be known." - "Herbert Spencer", J. Arthur Thomson.