Professor Tyndall accepts religious faith as an important element of human nature, but considers it as confined to the sentiments, and as not based in knowledge. He doubtless comes to this conclusion from following too implicitly the traditions of modern English psychology. These assume that knowledge comes only from without, through the senses, and never from within, through intuition. This prepossession, singularly English and insular, is thus stated by John Stuart Mill in his article on Coleridge. "Sensation, and the mind's consciousness of its own acts, are not only the exclusive sources, but the sole materials of our knowledge. There is no knowledge _a priori_; no truths cognizable by the mind's inward light, and grounded on intuitive evidence." These views have been developed in England by the two Mills, Herbert Spencer, Bain, and others, who have made great efforts to show how sensations may be transformed into thoughts; how association of ideas may have developed instincts; how hereditary impressions, repeated for a million years, may at last have taken on the aspect of necessary truths. In short, they have laid out great labor and ingenuity in proving that a sensation may, very gradually, be transformed into a thought. But all this labor is probably a waste of time and of intellectual power. The attempt at turning sensation into thought only results in turning thought into sensation. It is an error that we only know what we perceive through the senses, or transform by the action of the mind. It is not true that we only know that of which we can form a sensible image. We know the existence of the soul as certainly as that of the body. We know the infinite and the eternal as well as we know the finite and temporal. We know substance, cause, immortal beauty, absolute truth, as surely as the flitting phenomena which pass within the sphere of sensational experience. These convictions belong, not to the sphere of sentiment and emotion, but to that of knowledge. It is because they show us realities and not imaginations, that they nerve the soul to such vast efforts in the sphere of morals, literature, and religion.