In the case of a good many of these principles, inductive reasoning and experiment are out of the question; it will be next to impossible to test them in the ordinary course of life or in the ways available to the generality of mankind. But, nevertheless, these principles do rest upon very high authority. When carefully explained, they will be found to be the basis of every system of philosophy which human intellect has ever constructed, and furthermore, will also be found--I venture to promise--to be perfectly consistent with all that has been found out by man in the field of science; at any rate they give us a working hypothesis--a hypothesis which we may safely adopt at the commencement of our labours--for the time being. This hypothesis may be altered if you are quite certain that any new facts necessitate its alteration, but at any rate it is a working hypothesis which seems to explain all the facts which it is necessary for us to understand before we proceed upon a study of the gigantic and complicated machinery of nature.
Now to proceed with this hypothesis. First of all, I have to point out to you that any system of practical instruction for spiritual guidance will have to be judged, first, with reference to the nature and condition of man and the capabilities that are locked up in him; secondly, with reference to the cosmos and the forces to which man is subject and the circumstances under which he has to progress.