He made his own way in the trail of letters. He pursued plans of educating himself infinitely better than those followed in schools and universities. He has left us priceless testimony of the manner of his intellectual development. "Among my earliest recollections," said Lincoln, "I remember how when a child, I used to get irritated when anybody talked to me in a way I could not understand. I do not think I ever got angry at anything else in my life; but that always disturbed my temper and has ever since. I can remember going to my little bedroom, after hearing the neighbors talk of an evening with my father, and spending no small part of the night walking up and down and trying to make out what was the exact meaning of some of their, to me, dark sayings. I could not sleep though I tried to, when I got on such a hunt for an idea until I had caught it; and when I thought I had got it, I was not satisfied until I had repeated it over and over again; until I had put it in language plain enough, as I thought, for any boy I knew to comprehend. This was a kind of passion with me, and it has stuck by me; for I am never easy now, when I am handling a thought, till I have bounded it north and south and bounded it east and west. But your question reminds me of a bit of education which I am bound in honor to mention. In the course of my law reading I constantly came upon the word demonstrate. I thought at first that I understood its meaning, but soon became satisfied that I did not. I said to myself, 'What do I mean when I demonstrate more than when I reason or prove?' I consulted Webster's Dictionary. That told of certain proof,--proof beyond the probability of a doubt, but I could form no sort of idea what proof it was. I thought a great many things were proved beyond the possibility of a doubt, without recourse to any such reasoning as I understood demonstration to be. I consulted all the dictionaries and books of reference I could find, but with no better results. You might as well have defined blue to a blind man. At last I said, 'Lincoln, you can never make a lawyer if you do not understand what demonstrate means;' and I left my situation in Springfield, went home to my father's house, and stayed there until I could give any proposition in the six books of Euclid at sight. I then found out what demonstrate meant, and went back to my law studies."[24] [24] Tarbell, 1, 43. Inadequate as his education may have been objectively, Lincoln was supremely trained in the college of lonely thought. No American of eminence owes less to the public school system. His entire career is a mystery unless full value is given to the statement of Herndon that "Lincoln read less and thought more than any other man of his time."[A] [A] Oldroyd, 533.