In order to reassure readers who might object to having the student left in this condition of reversed tastes, we may add that the Yogi teachers then teach him to get rid of the idea of the disliked thing, and teach him to cultivate a liking for all wholesome things, their theory being that the dislike of certain wholesome eatables has been caused by some suggestion in childhood, or by some prenatal impression, as wholesome eatables are made attractive to the taste by Nature. The idea of all this training, however, is not the cultivation of taste, but practice in mental training, and the bringing home to the student the truth of the fact that his nature is plastic to his Ego, and that it may be moulded at will, by concentration and intelligent practice. The reader of this lesson may experiment upon himself along the lines of the elementary Yogi practice as above mentioned, if he so desires. He will find it possible to entirely change his dislike for certain food, etc., by the methods mentioned above. He may likewise acquire a liking for heretofore distasteful tasks and duties, which he finds it necessary to perform. The principle underlying the whole Yogi theory of Character Building by the sub-conscious Intellect, is that the Ego is Master of the mind, and that the mind is plastic to the commands of the Ego. The Ego or "I" of the individual is the one real, permanent, changeless principle of the individual, and the mind, like the body, is constantly changing, moving, growing, and dying. Just as the body may be developed and moulded by intelligent exercises, so may the mind be developed and shaped by the Ego if intelligent methods are followed. The majority of people consider that Character is a fixed something, belonging to a man, that cannot be altered or changed. And yet they show by their everyday actions that at heart they do not believe this to be a fact, for they endeavor to change and mould the characters of those around them, by word of advice, counsel, praising or condemnation, etc. It is not necessary to go into the matter of the consideration of the causes of character in this lesson. We will content ourselves by saying that these causes may be summed up, roughly, as follows: (1) Result of experiences in past lives; (2) Heredity; (3) Environment; (4) Suggestion from others; and (5) Auto-suggestion. But no matter how one's character has been formed, it may be modified, moulded, changed, and improved by the methods set forth in this lesson, which methods are similar to what is called by Western writers, "Auto-suggestion."