Having now obtained a glimpse of the adaptation of the physical organism to the action of the mind we must next realize that the mind itself is an organism which is in like manner adapted to the action of a still higher power, only here the adaptation is one of mental faculty. As with other invisible forces all we can know of the mind is by observing what it does, but with this difference, that since we ourselves _are_ this mind, our observation is an interior observation of states of consciousness. In this way we recognize certain faculties of our mind, the working order of which I have considered at page 84; but the point to which I would now draw attention is that these faculties always work under the influence of something which stimulates them, and this stimulus may come either from without through the external senses, or from within by the consciousness of something not perceptible on the physical plane. Now the recognition of these interior sources of stimulus to our mental faculties, is an important branch of Mental Science, because the mental action thus set up works just as accurately through the physical correspondences as those which start from the recognition of external facts, and therefore the control and right direction of these inner perceptions is a matter of the first moment. The faculties most immediately concerned are the intuition and the imagination, but it is at first difficult to see how the intuition, which is entirely spontaneous, can be brought under the control of the will. Of course, the spontaneousness of the intuition cannot in any way be interfered with, for if it ceased to act spontaneously it would cease to be the intuition. Its province is, as it were, to capture ideas from the infinite and present them to the mind to be dealt with at its discretion. In our mental constitution the intuition is the point of origination and, therefore, for it to cease to act spontaneously would be for it to cease to act at all. But the experience of a long succession of observers shows that the intuition can be trained so as to acquire increased sensitiveness in some, particular direction, and the choice of the _general direction_ is determined by the will of the individual.