By this text the teacher confirms the idea that Brahman is unthinkable, because unconditioned. Therefore he says: He who considers It beyond thought, beyond sense-perception, beyond mind and speech, he alone has a true understanding of Brahman. They who judge a living being from his external form and sense faculties, know him not; because the real Self of man is not manifested in his seeing, hearing, speaking. His real Self is that within by which he hears and speaks and sees. In the same way he knows not Brahman who thinks he knows It by name and form. The arrogant and foolish man thinks he knows everything; but the true knower is humble. He says: "How can I know Thee, who art Infinite and beyond mind and speech?" In the last portion of the text, the teacher draws an impressive contrast between the attitude of the wise man who knows, but thinks he does not know; and that of the ignorant who does not know, but thinks he knows. IV It (Brahman) is known, when It is known in every state of consciousness. (Through such knowledge) one attains immortality. By attaining this Self, man gains strength; and by Self-knowledge immortality is attained. We have learned from the previous text that the Brahman is unknown to those whose knowledge is limited to sense experience; but He is not unknown to those whose purified intelligence perceives Him as the basis of all states of consciousness and the essence of all things. By this higher knowledge a man attains immortality, because he knows that although his body may decay and die, the subtle essence of his being remains untouched. Such an one also acquires unlimited strength, because he identifies himself with the ultimate Source. The strength which comes from one's own muscle and brain or from one's individual power must be limited and mortal and therefore cannot lift one beyond death; but through the strength which Atma-gnana or Self-knowledge gives, immortality is reached. Whenever knowledge is based on direct perception of this undying essence, one transcends all fear of death and becomes immortal. V If one knows It here, that is Truth; if one knows It not here, then great is his loss. The wise seeing the same Self in all beings, being liberated from this world, become immortal. Part Third I The Brahman once won a victory for the Devas. Through that victory of the Brahman, the Devas became elated. They thought, "This victory is ours. This glory is ours."