What the ancients say about these secrets is significant, but at the same time ambiguous. The initiate is convinced that it would be a sin to tell what he knows and also that it would be sinful for the uninitiated to listen. Plutarch speaks of the terror of those about to be initiated, and compares their state of mind to preparation for death. A special mode of life had to precede initiation, tending to give the spirit the mastery over the senses. Fasting, solitude, mortifications, and certain exercises for the soul were the means employed. The things to which man clings in ordinary life were to lose all their value for him. The whole trend of his life of sensation and feeling was to be changed. There can be no doubt as to the meaning of such exercises and tests. The wisdom which was to be offered to the candidate for initiation could only produce the right effect upon his soul if he had previously purified the lower life of his sensibility. He was introduced to the life of the spirit. He was to behold a higher world, but he could not enter into relations with that world without previous exercises and tests. The relations thus gained were the condition of initiation. In order to obtain a correct idea on this matter, it is necessary to gain experience of the intimate facts of the growth of knowledge. We must feel that there are two widely divergent attitudes towards that which the highest knowledge gives. The world surrounding us is to us at first the real one. We feel, hear, and see what goes on in it, and because we thus perceive things with our senses, we call them real. And we reflect about events, in order to get an insight into their connections. On the other hand, what wells up in our soul is at first not real to us in the same sense. It is "merely" thoughts and ideas. At the most we see in them only images of reality. They themselves have no reality, for we cannot touch, see, or hear them.