This principle of the power of the Mental Image is strongly impressed upon the mind of the _chela_, or student, by the Yogi teachers. The student is taught that just as the house is erected in accordance with the plan of the architect, so is one's life built in accordance with the prevailing Mental Image. The mind sub-consciously moulds itself around the prevailing mental image or attitude, and then proceeds to draw upon the outer world for material with which to build in accordance with the plan. Not only is one's character built in this way, but the circumstances and incidents of his life follow the same rule. The Yogi student is instructed into the mysteries of the power of the mind in this direction, not that he may make use of it to build up material success, or to realize his personal desires--for he is taught to avoid these things--but he is fully instructed, nevertheless, that he may understand the workings of the law around him. And it is a fact well known to close students of the occult, that the few who have attained extraordinarily high degrees of development, make use of this power in order to help the race. Many a world movement has been directed by the mind, or minds, of some of these advanced souls who were able to see the ideal of evolution ahead of the race, and by visualizing the same, and concentrating upon it in meditation, actually hastened the progress of the evolutionary wave, and caused to actually manifest that which they saw, and upon which they had meditated.