(3) The knowledge which others acquire by laborious learning comes to them by intuition.
These three, of course, are not the only marks which differentiate them from common people, but the only ones that come within our cognisance. Just as no one knows the real nature of God but God Himself, so no one knows the real nature of a prophet but a prophet. Nor is this to be wondered at, as in every-day matters we see that it is impossible to explain the charm of poetry to one whose ear is insusceptible of cadence and rhythm, or the glories of colour to one who is stone-blind. Besides mere incapacity, there are other hindrances to the attainment of spiritual truth. One of these is externally acquired knowledge. To use a figure, the heart may be represented as a well, and the five senses as five streams which are continually conveying water to it. In order to find out the real contents of the heart these streams must be stopped for a time, at any rate, and the refuse they have brought with them must be cleared out of the well. In other words, if we are to arrive at pure spiritual truth, we must put away, for the time, knowledge which has been acquired by, external processes and which too often hardens into dogmatic prejudice.
A mistake of an opposite kind is made by shallow people who, echoing some phrases which they have caught from Sufi teachers, go about decrying all knowledge. This is as if a person