Each one of them tells you to cling to your reason to hold fast to it. We find in all beings three sorts of instruments of knowledge. The first is instinct, which you find most highly developed in animals; this is the lowest instrument of knowledge. What is the second instrument of knowledge? Reasoning.
You find that most highly developed in man. Now in the first place, instinct is an inadequate instrument; to animals, the sphere of action is very limited, and within that limit instinct acts. When you come to man, you see it is largely developed into reason. The sphere of action also has here become enlarged. Yet even reason is still very insufficient.
Reason can go only a little way and then it stops, it cannot go any further; This world, this universe which our senses feel, or our mind thinks, is but one atom, so to say, of the Infinite, projected on to the plane of consciousness; and within that narrow limit, defined by the network of consciousness, works our reason, and not beyond. Therefore, there must be some other instrument to take us beyond, and that instrument is called inspiration.
So instinct, reason, and inspiration are the three instruments of knowledge. Instinct belongs to animals, reason to man, and inspiration to God-men. But in all human beings are to be found, in a more or less developed condition, the germs of all these three instruments of knowledge.
To have these mental instruments evolved, the germs must be there. And this must also be remembered that one instrument is a development of the other, and therefore does not contradict it. It is reason that develops into inspiration, and therefore inspiration does not contradict reason, but fulfils it.
Things which reason cannot get at are brought to light by inspiration; and they do not contradict reason. The old man does not contradict the child, but fulfils the child. (II -389-90)
Instinct, reasoning and inspiration are the three modes of acquiring knowledge.
Each one fulfills the other. Blessed indeed is he, who can effortlessly bring out the faculty of inspiration. It depends on the purity of the mind and the fine tuning of the faculties within.