“Oh! A mystery is it?' I cried, rubbing my hands. 'This is very piquant. I am much obliged to you for bringing us together. "The proper study of mankind is man" you know”

“I am not a very good man, Effie, but I think that I am a better one than you have given me credit for being.”

“I should be very much obliged if you would slip your revolver into your pocket. An Eley's No. 2 is an excellent argument with gentlemen who can twist steel pokers into knots. That and a tooth-brush are, I think, all that we need.”

“By a man's finger-nails, by his coat-sleeve, by his boots, by his trouser-knees, by the callosities of his forefinger and thumb, by his expression, by his shirt-cuff — By each of these things a man's calling is plainly revealed. That all united should fail to enlighten the competent inquirer in any case is almost inconceivable. You know that a conjurer gets no credit when once he has explained his trick; and if I show you too much of my method of working, you will come to the conclusion that I am a very ordinary individual after all.”

“By the way, Doctor, I shall want your cooperation.''I shall be delighted.''You don't mind breaking the law?''Not in the least.''Nor running a chance of arrest?''Not in a good cause.''Oh, the cause is excellent!''Then I am your man.''I was sure that I might rely on you.”

“Really, Watson, you excel yourself," said Holmes, pushing back his chair and lighting a cigarette. "I am bound to say that in all the accounts which you have been so good as to give of my own small achievements you have habitually underrated your own abilities. It may be that you are not yourself luminous, but you are a conductor of light. Some people without possessing genius have a remarkable power of stimulating it. I confess, my dear fellow, that I am very much in your debt.”

“The most serious point in the case is the disposition of the child."What on earth has that to do with it?" I ejaculated.My dear Watson, you as a medical man are continually gaining insight as to the tendencies of a child by the study of the parents. Don't you see that the converse is equally valid. I have frequently gained my first real insight into the character of parents by studying their children.”