If your astral body were thoroughly organised like your physical, the impressions made would be clear and sharp like the physical.

If your mental body were well organised, the impressions of that plane, the heavenly plane, would be clear and sharp like the physical.

But as the astral and mental bodies at this stage of evolution are not well organised, the impressions received by them, causing changes in the consciousness, are vague and indeterminate, and it is these which are generally called "psychic." And when you have a Psychical Research Society, it is not dealing with the ordinary processes of thought, but with those which are not ordinary; and all those things to which it gives many strange names are all workings of the consciousness, in sheaths or bodies of which it has not yet gained the mastery, which it has not yet definitely organised for its purposes.

Slowly and gradually they become organised, and strenuous thinking is the method for the astral body, and the working of the pure reason is the method for the mental body.
Let us consider with regard to this, whether there is any other way of bringing the astral body and mental body into activity.

For you may have noticed that I used the word "normal" evolution, orderly evolution on the lines of natural evolution, always from above.