Spiritual knowledge is a regular science. Just as two and two make four, similarly everything is clean and obvious here also and there is no scope for any kind of modification or change in that.
The subject of spirituality is concerned purely with the problems connected with the spirit or soul – to wit, its origin or source, what it is, its seat in the body and its relation thereto, how it functions in the physical world, whether it is possible to separate it at will from the body and bodily adjuncts, the mind and the senses, and if so, the various processes connected therewith. It deals with the spiritual journey through different spiritual planes and the spirit's capability of traversing the same, the ultimate goal or destination to which this journey leads, and other allied topics, such as the welfare of the spirit, how to feed it and with what, for on its health depends the health of the mind and the body. These are some of the vital questions that fall within the purview of our inquiry.
Sant Kirpal Singh
An introduction to the subject, written for the benefit of the growing number of seekers to enable them to discriminate between true spirituality and the numerous techniques and practices leading to occult powers.
First edition 1959