He has considerable gifts himself. He possesses two out of the three qualities necessary for the ideal detective. He has the power of observation and… - Arthur Conan Doyle

I shall never do that,' I answered; 'you have brought detection as near an exact science as it ever will be brought in this world.

When the spirits are low, when the day appears dark, when work becomes monotonous, when hopes seem hardly worth having, just mount a bicycle and go for a good spin down the road, without thought of anything but the ride you are taking.

His very person and appearance were such as to strike the attention of the most casual observer. In height he was rather over six feet, and so excessively lean that he seemed to be considerably taller. His eyes were sharp and piercing, save during those intervals of torpor to which I have alluded; and his thin, hawk-like nose gave his whole expression an air of alertness and decision. His chin, too, had the prominence and squareness which mark the man of determination. His hands were invariably blotted with ink and stained with chemicals, yet he was possessed of extraordinary delicacy of touch, as I frequently had occasion to observe when I watched him manipulating his fragile philosophical instruments.