Throughout the Vedic Scriptures it is declared that no one can impart spiritual knowledge unless he has realization. What is meant by realization? It means knowledge based on direct perception. In India often the best teachers have no learning, but their character is so shining that every one learns merely by coming in contact with them. In one of the Scriptures we read: Under a banyan tree sat a youthful teacher and beside him an aged disciple. The mind of the disciple was full of doubts and questions, but although the teacher continued silent, gradually every doubt vanished from the disciple's mind. This signifies that the conveying of spiritual teaching does not depend upon words only. It is the life, the illumination, which counts. Such God-enlightened men, however, cannot easily be found; but even with such a teacher, the knowledge of the Self cannot be gained unless the heart of the disciple is open and ready for the Truth. Hence Yama says both teacher and taught must be wonderful. VIII When taught by a man of inferior understanding, this Atman cannot be truly known, even though frequently thought upon. There is no way (to know It) unless it is taught by another (an illumined teacher), for it is subtler than the subtle and beyond argument. IX O Dearest, this Atman cannot be attained by argument; It is truly known only when taught by another (a wise teacher). O Nachiketas, thou hast attained It. Thou art fixed in Truth. May we ever, find a questioner like thee. Knowledge of the Atman or Self cannot be attained when it is taught by those who themselves lack in real understanding of It; and who therefore, having no definite conviction of their own, differ among themselves as to its nature and existence. Only he who has been able to perceive the Self directly, through the unfoldment of his higher nature, can proclaim what It actually is; and his words alone carry weight and bring illumination. It is too subtle to be reached by argument. This secret regarding the Hereafter cannot be known through reasoning or mere intellectual gymnastics. It is to be attained only in a state of consciousness which transcends the boundary line of reason. X I know that (earthly) treasure is transitory, for the eternal can never be attained by things which are non-eternal. Hence the Nachiketa fire (sacrifice) has been performed by me with perishable things and yet I have attained the eternal. XI O Nachiketas, thou hast seen the fulfillment of all desires, the basis of the universe, the endless fruit of sacrificial rites, the other shore where there is no fear, that which is praiseworthy, the great and wide support; yet, being wise, thou hast rejected all with firm resolve.