It seems to me there is some confusion in this letter between obtaining knowledge by experiment, and testing it by experiment. Edison knew that his discoveries were only things to look for, and he tested his knowledge by experiment. The actual work of great inventors is the bringing of intuitive knowledge on to the plane of practice by applying the test of experiment. But all inventors are seers; and some of them having died without being able to put into practice the powers which they knew existed in Nature were considered madmen. Later on, other men are more fortunate, and re-discover the laughed-at knowledge. This is an old and familiar story, but we need constantly to be reminded of it. How often have great musicians or great artists been regarded as “infant prodigies” in their childhood? They have intuitive knowledge of that power of which they are chosen interpreters, and experiment is only necessary in order to find out how to give that which they know to others. Intuitive knowledge in reference to the subjects with which I have been dealing must indeed be tested by experiment; and it is the whole purpose of “Light on the Path” itself, and the “Comments” to urge men to test their knowledge in this way. But the vital difference between this and material forms of knowledge is that for all occult purposes a man must obtain his own knowledge before he can use it. There are many subjects of time content to linger on through æons of slow development, and pass the threshold of eternity at last by sheer force of the great wheel of life with which they move; possibly during their interminable noviciate, they may obtain knowledge by experiment and with well-tested tools. Not so the pioneer, the one who claims his divine inheritance now. He must work as the great artists, the great inventors have done; obtain knowledge by intuition, and have such sublime faith in his own knowledge that his life is readily devoted to testing it. But for this purpose the testing has to be actually done in the astral life. In a new world, where the use of the senses is a pain, how can the workman stay to test his tools? The old proverb about the good workman who never quarrels with them, however bad they are, though of course had he the choice he would use the best, applies here. As to whether intuitive knowledge exists or no, I can only ask how came philosophies, metaphysics, mathematics into existence? All these represent a portion of abstract truth. Before I received this letter the “Comments” for this month were written, in which, as it happens, I have spoken a great deal about intuitive knowledge. Therefore, I will now only quote the definition of a philosopher from Plato, which is given near the end of Book V.,—