“A mistake!” he cried. “Action is the thing that blinds men. You remember Matthew Arnold’s line: In action’s dizzying eddy whurled. To know the world you must stand apart from it and above it; you must look down on it.” “Well, then,” said I, “you will have to find some secret spring of inspiration, some point of vantage from which you can get your outlook and your insight.” He stopped short and looked me full in the face. “And that,” cried he, “is precisely what I have found!” Then he turned and pushed along the narrow trail so swiftly that I had hard work to follow him. After a few minutes we came to a little stream, flowing through a grove of hemlocks. Keene seated himself on the fallen log that served for a bridge and beckoned me to a place beside him. “I promised to give you an explanation to-day--to take you on one of my long walks. Well, there is only one of them. It is always the same. You shall see where it leads, what it means. You shall share my secret--all the wonder and glory of it! Of course I know my conduct, has seemed strange to you. Sometimes it has seemed strange even to me. I have been doubtful, troubled, almost distracted. I have been risking a great deal, in danger of losing what I value, what most men count the best thing in the world. But it could not be helped. The risk was worth while. A great discovery, the opportunity of a lifetime, yes, of an age, perhaps of many ages, came to me. I simply could not throw it away. I must use it, make the best of it, at any danger, at any cost. You shall judge for yourself whether I was right or wrong. But you must judge fairly, without haste, without prejudice. I ask you to make me one promise. You will suspend judgment, you will say nothing, you will keep my secret, until you have been with me three times at the place where I am now taking you.” By this time it was clear to me that I had to do with a case lying far outside of the common routine of life; something subtle, abnormal, hard to measure, in which a clear and careful estimate would be necessary. If Keene was labouring under some strange delusion, some disorder of mind, how could I estimate its nature or extent, without time and study, perhaps without expert advice? To wait a little would be prudent, for his sake as well as for the sake of others. If there was some extraordinary, reality behind his mysterious hints, it would need patience and skill to test it. I gave him the promise for which he asked.