These two acts are not always associated, though they are commonly regarded as inseparable. It is a common postulate that if you have a pain you will know it, or notice it. If we feel pained, we always know it. This seemingly true statement comes of a confounding of terms. If I have a pain, I must, indeed, be aware of it, know it, in the sense that it must be in consciousness; but this makes, aware of pain, and knowing pain, such very general phrases as to equal experience of pain or having pain. But there is no knowledge in pain itself, nor pain in the knowing act _per se_. The knowing the pain must be different from the pain itself, and is not always a necessary sequent. We may experience pain without cognizing it as such. When drowsy in bed I may feel pain of my foot being “asleep,” but not know it as a mental fact. We may believe, indeed, that pain often rises and subsides in consciousness without our being cognizant of it, but, of course, in the nature of the case there is no direct proof, for proof implies cognizance of fact. Pain as mental fact, an object for consciousness, not an experience in consciousness, is what is properly meant by knowing pain. Consciousness-of-pain as knowledge of it is not always involved by pain-in-consciousness as experience of it. Consciousness of pain by its double meaning as cognizance of pain and experience of pain leads easily to obscurity of thought upon this subject. But experience does not, if we may trust the general law of evolution from simple to complex, at the first contain consciousness of experience. This latter element is but gradually built up into experience, though in the end they are so permanently united in developed ego life that it is difficult to perceive their distinctness and independence. That pain and pleasure are cognized as facts of consciousness seems to us clear, but this does not deny that for us, at least, they may be cognizable only in fusion with other elements, as with sensation or volition. But whether known only with other elements or not, pleasure-pain is equally known only by direct introspection. I know directly and immediately pain and pleasure when I experience them, though they always occur bound up with some sensation. It may be that I never experience mere pain but some kind of pain, as a pricking pain, burning pain, etc., and that I always recall pain by its sensation tone, that I cannot isolate it by any act of attention. (E. B. Titchener, _Philosophical Review_, vol. iii., p. 431.) However I know that I have pain as well as I know that I have a pricking or burning sensation. “Did you feel the prick?” “Yes.” “Was it painful or pleasurable?” “Pleasurable”; such a common colloquy implies as direct consciousness of the pleasure-pain as of the sensation. That I can at once discriminate a sensation as either pleasurable or painful certainly shows a direct awareness of pleasure-pain.