The mental imaging of colors may be materially aided by concentration upon physical material of the right color. By concentrating the attention and vision upon a red flower, for instance; or upon a bit of green leaf, in another instance; one may be able to form a clear, positive mental image of that particular color. This accompanied by the willing, and demand, that the vibrations of this color shall charge the aura, will be found to accomplish the result. Have something around you showing the desirable colors, and your attention will almost instinctively take up the impression thereof, even though you may be thinking of, or doing something else. Live as much as possible in the idea and presence of the desirable color, and you will get the habit of setting up the mental image and vibration thereof. A little practice and experience will soon give you the idea, and enable you to get the best results. Patience, perseverance, and sustained earnest interest--that is the key of success. CHAPTER X. THE PROTECTIVE AURA. Among the very oldest of the teachings of occultism, we find instructions regarding the building up and maintenance of the protective aura of the individual, whereby he renders himself immune to undesirable physical, mental, psychic or spiritual influences. So important is this teaching, that it is to be regretted that there has not been more said on the subject by some of the writers of recent years. The trouble with many of these recent writers is that they seem to wish to close their eyes to the unpleasant facts of life, and to gaze only upon the pleasant ones. But this is a mistake, for ignorance has never been a virtue, and to shut one's eyes to unpleasant facts does not always result in destroying them. I consider any teaching unfinished and inadequate which does not include instruction along protective lines. Physical auric protection consists in charging the aura with vital magnetism and color, which will tend to ward off not only the physical contagion of ill persons, but, what is often still more important, the contagion of their mind and feelings. The student who has really studied the preceding chapters will at once realize that this protection is afforded by filling the aura with the vibrations of health and physical strength, by means of the mental imaging of the life-preserving reds, and the exercise of the mind in the direction of thought of strength and power. These two things will tend to greatly increase the resistive aura of anyone, and enable him to throw off disease influences which affect others.