You see, but you do not observe.

If in 100 years I am only known as the man who invented Sherlock Holmes then I will have considered my life a failure.

To a great mind, nothing is little,' remarked Holmes, sententiously.

The grand thing is to be able to reason backwards.

The Adventure of the Noble Bachelor

There is nothing like first-hand evidence.

You're not hurt, Watson? For God's sake, say that you are not hurt!" It was worth a wound -- it was worth many wounds -- to know the depth of loyalty and love which lay behind that cold mask. The clear, hard eyes were dimmed for a moment, and the firm lips were shaking. For the one and only time I caught a glimpse of a great heart as well as of a great brain. All my years of humble but single-minded service culminated in that moment of revelation.