This section is from the book "The Sacred Book Of Death", by Lauron William De Laurence. Also available from Amazon: The Sacred Book of Death - Hindu Spiritism Soul Transition and Soul Reincarnation.
Second-sight usually occurs spontaneously. The will nevertheless often plays an important part in producing this phenomenon. Take, for example, the persons who are called fortune tellers - and some of them really have that power - and you will find that action of their will helps them to this Second-Sight and to what you call vision. Clairvoyance or second-sight is susceptible of being developed by certain Hindu Occult Exercises which will be given later on in this volume. Sincere effort and application always leads to progress in Occult Powers as in, anything else and the veil that hides Occult and Spirit Mystery will readily become transparent to the sincere student. The reason why clairvoyancy is hereditary in certain people is because of the development of these faculties by application and education in those who have transmitted it from one generation to another. This applies to the Hindus more than to any other race of people. It is true that circumstances develop second-sight. Illness, the approach of danger, any great commotion may develop it. The body is sometimes in a state which allows of the spirit's seeing what cannot be seen with the physical eye.
In times of great excitement and of calamity, powerful emotions, all the causes, in short, which excite the soul may develop second-sight It would seem as though Providence gave us when in the presence of danger, the means of escaping it. All creeds and all people subjected to persecution have offered numerous instances of this fact. Clairvoyants do, and can, give foreknowledge of future events; they may also give presentiments of great danger, for there are many degrees in this faculty, and the same person may possess all those degrees, as he may possess only some of them. The phenomena of natural somnambulism occur, spontaneously, and independently of any known external cause; not only in persons endowed with a special organization or gift, for clairvoyancy may be produced by any one having a knowledge of Eastern Occultism. The only difference between the state designated as self-induced somnambulism, and natural somnambulism is, that the one is produced by development, while the other is spontaneous.
 
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