“You are, of course, a sentimentalist and doubtless you look with horror upon many of the acts of a sane, rational, scientific mind; but you are also highly intelligent and can, therefore, appreciate better than another, even though you may not approve them, the motives that prompt me to do many of those things of which your sentimentality disapproves. I may have offended you, but I have never wronged you, nor have I wronged any creature for which you might have felt some of your so-called friendship or love. Are my premises incorrect, or my reasoning faulty?” I assured him to the contrary. “Very well! Now let me explain why I have gone to such pains to train you as no other human being, aside from myself, has ever been trained. I am not ready to use you yet, or rather you are not ready; but if you know my purpose you will realize the necessity for bending your energy to the consummation of my purpose, and to that end you will strive even more diligently than you have to perfect yourself in the high, scientific art I am imparting to you. “I am a very old man,” he continued after a brief pause, “even as age goes upon Barsoom. I have lived more than a thousand years. I have passed the allotted natural span of life, but I am not through with my life’s work—I have but barely started it. I must not die. Barsoom must not be robbed of this wondrous brain and skill of mine. I have long had in mind a plan to thwart death, but it required another with skill equal to mine—two such might live for ever. I have selected you to be that other, for reasons that I already have explained—they are undefiled by sentimentalism. I did not choose you because I love you, or because I feel friendship for you, or because I think that you love me, or feel friendship towards me. I chose you because I knew that of all the inhabitants of a world you were the one least likely to fail me. For a time you will have my life in your hands. You will understand now why I have not been able to choose carelessly.” “This plan that I have chosen is simplicity itself provided that I can count upon just two essential factors—skill and self-interested loyalty in an assistant. My body is about worn out. I must have a new one. My laboratory is filled with wonderful bodies, young and complete with potential strength and health. I have but to select one of these and have my skilled assistant transfer my brain from this old carcass to the new one.” He paused. “I understand now, why you have trained me,” I said. “It has puzzled me greatly.”