Such is the doctrine which Plato here lays down, respecting the difference between sensible perception, and knowledge or cognition. From his time to the present day, the same topic has continued to be discussed, with different opinions on the part of philosophers. Plato's views are interesting, as far as his language enables us to make them out. He does not agree with those who treat sensation or sensible perception (in his language, the two are not distinguished) as a bodily phenomenon, and intelligence as a mental phenomenon. He regards both as belonging to the mind or soul. He considers that the mind is sentient as well as intelligent: and moreover, that the sentient mind is the essential basis and preliminary--universal among men and animals, as well as coæval with birth--furnishing all the matter, upon which the intelligent mind has to work. He says nothing, in this dialogue, about the three distinct souls or minds (rational, courageous, and appetitive), in one and the same body, which form so capital a feature in his Timæus and Republic: nothing about eternal, self-existent, substantial Ideas, or about the pre-existence of the soul and its reminiscence as the process of acquiring knowledge. Nor does he countenance the doctrine of innate ideas, instinctive beliefs, immediate mental intuitions, internal senses, &c., which have been recognised by many philosophers. Plato supposes the intelligent mind to work altogether upon the facts of sense; to review and compare them with one another; and to compute facts present or past, with a view to the future. All this is quite different from the mental intuitions and instincts, assumed by various modern philosophers as common to all mankind. The operations, which Plato ascribes to the intelligent mind, are said to be out of the reach of the common man, and not to be attainable except by a few, with difficulty and labour. The distinctive feature of the sentient mind, according to him, is, that it operates through a special bodily organ of sense: whereas the intelligent mind has no such special bodily organ. [Side-note: Different views given by Plato in other dialogues.]