It was surely well for man that he came late in the order of creation. There were powers abroad in earlier days which no courage and no mechanism of … - Arthur Conan Doyle

"You have done all the work in this business. I get a wife out of it, Jones gets the credit, pray what remains for you?"
"For me," said Sherlock Holmes, "there still remains the cocaine bottle."

To the logician all things should be seen exactly as they are, and to underestimate one's self is as much a departure from truth as to exaggerate one's own powers. When I say, therefore, that Mycroft has better powers of observation than I, you may take it that I am speaking the exact and literal truth.

"The man might have died in a fit; but then the jewels are missing," mused the Inspector, "Ha! I have a theory. These flashes come upon me at times... What do you think of this, Holmes? Sholto was, on his own confession, with his brother last night. The brother died in a fit, on which Sholto walked off the treasure! How's that?"
"On which the dead man very considerately got up and locked the door on the inside," said Holmes.