In this common mode of thinking, popular ideas have the truth turned upside down. The fact is that science, not religion, is the realm where most of all we use external authority. They tell us that there are millions of solar systems scattered through the fields of space. Is that true? How do we know? We never counted them. We know only what the authorities say. They tell us that the next great problem in science is breaking up the atom to discover the incalculable resources of power there waiting to be harnessed by our skill. Is that true? Most of us do not understand what an atom is, and what it means to break one up passes the farthest reach of our imaginations; all we know is what the authorities say. They tell us that electricity is a mode of motion in ether. Is that true? Most of us have no first hand knowledge about electricity. The motorman calls it "juice" and that means as much to us as to call it a mode of motion in ether; we must rely on the authorities. They tell us that sometime we are going to talk through wireless telephones across thousands of miles, so that no man need ever be out of vocal communication with his family and friends. Is that true? It seems to us an incredible miracle, but we suppose that it is so, as the authorities say. In a word, the idea that we do not use authority in science is absurd. Science is precisely the place where nine hundred and ninety-nine men out of a thousand use authority the most. The chemistry, biology, geology, astronomy which the authorities teach is the only science which most of us possess. There is another realm, however, where we never think of taking such an attitude. They tell us that friendship is beautiful. Is that true? Would we ever think of saying that we do not know, ourselves, but that we rely on the authorities? Far better to say that our experience with friendship has been unhappy and that we personally question its utility! That, at least, would have an accent of personal, original experience in it. For here we are facing a realm where we never can enter at all until we enter, each man for himself. Two realms exist, therefore, in each of which first-hand experience is desirable, but in only one of which it is absolutely indispensable. We can live on what the authorities in physics say, but there are no proxies for the soul. Love, friendship, delight in music and in nature, parental affection--these things are like eating and breathing; no one can do them for us; we must enter the experience for ourselves. Religion, too, belongs in this last realm. The one vital thing in religion is first-hand, personal experience. Religion is the most intimate, inward, incommunicable fellowship of the human soul. In the words of Plotinus, religion is "the flight of the alone to the Alone." You never know God at all until you know him for yourself. The only God you ever will know is the God you do know for yourself.