“I said that he was my superior in observation and deduction. If the art of the detective began and ended in reasoning from an armchair, my brother would be the greatest criminal agent that ever lived. But he has no ambition and no energy. He will not even go out of his way to verify his own solutions, and would rather be considered wrong than take the trouble to prove himself right.”

“We need to talk," he insisted, opening the door to his jeep that was parked next to my car. I was still holding out hope this would end and I would see his smile soon. "What's wrong?" I retaliated before I go in. "There's something you need to know, something I haven't told you," he said, taking my backpack from me.”

“whether to follow uncritically the track he finds himself in, without considering his aptness for it, or to consider what his aptness or bent may be, and reshape his course accordingly. I tried to do the latter, and I failed. But I don't admit that my failure proved my view to be a wrong one, or that my success would have made it a right one; though that's how we appraise such attempts nowadays.”

“[...] it seems to me that the moralist is the most useless and contemptible of creatures. He is useless in that he would expend his energies upon making judgments rather than upon gaining knowledge, for the reason that judgment is easy and knowledge is difficult. He is contemptible in that his judgments reflect a vision of himself which in his ignorance and pride he would impose upon the world. I implore you, do not become a moralist; you will destroy your art and your mind.”

“He was, I take it, the most perfect reasoning and observing machine that the world has seen, but as a lover he would have placed himself in a false position. He never spoke of the softer passions, save with a gibe and a sneer. They were admirable things for the observer- excellent for drawing the veil from men's motives and actions. But for the trained observer to admit such intrusions into his own delicate and finely adjusted temperament was to introduce a distracting factor which might throw a doubt upon all his mental results. Grit in a sensitive instrument, or a crack in one of his own high-power lenses, would not be more disturbing than a strong emotion in a nature such as his.”

“His ambition was not to become wealthy or to be well known, an image which society for some reason dictates each individual should prescribe to, instead his only ambition was to be at peace with himself, if he could achieve that than anything else he might need would follow. From now on he would question all things in life, but especially the rules and regulations of all authority institutions; he would take nothing on face value and only would accept what he personally knew to undeniably be true.”