"Yet there is one practice which is advised by all religions alike--which if adopted carefully and reverently can do no harm to any human being, yet from which a very pure type of clairvoyance has sometimes been developed; and that is the practice of meditation. Let a man choose a certain time every day--a time when he can rely upon being quiet and undisturbed, though preferably in the daytime rather than at night--and set himself at that time to keep his mind for a few minutes entirely free from all earthly thoughts of any kind whatever, and, when that is achieved, to direct the whole force of his being towards the highest ideal that he happens to know. He will find that to gain such perfect control of thought is enormously more difficult than he supposes, but when he attains it it cannot but be in every way most beneficial to him, and as he grows more and more able to elevate and concentrate his thought, he may gradually find that new worlds are opening before his sight. As a preliminary training towards the satisfactory achievement of such meditation, he will find it desirable to make a practice of concentration in the affairs of daily life--even in the smallest of them. If he writes a letter, let him think of nothing else but that letter until it is finished; if he reads a book, let him see to it that his thought is never allowed to wander from his author's meaning. He must learn to hold his mind in check, and to be master of that also, as well as of his lower passions; he must patiently labor to acquire absolute control of his thoughts, so that he will always know exactly what he is thinking about, and why--so that he can use his mind, and turn it or hold it still, as a practiced swordsman turns his weapon where he will." I have given the above full quotation from this authority, not merely because that from another angle he states the same general principles as do I; but also because his personal experience in actual clairvoyant phenomena is so extended and varied that any word from him on the subject of the development of clairvoyant power must have a value of its own. While I differ from this authority on some points of detail of theory and practice, nevertheless I gladly testify to the soundness of his views as above quoted, and pass them on to my students for careful consideration and attention. The student will do well to heed what he has to say, and to combine such opinion with what I have uttered in the earlier part of this chapter--there will be found a close agreement in principle and practice.