To let the brain work without sufficient material is like racing an engine. It racks itself to pieces. The sea air, sunshine, and patience, Watson—all else will come.

I get in the dumps at times, and don't open my mouth for days on end. You must not think I am sulky when I do that. Just let me alone, and I'll soon be right.

I am inclined to think -' said I. `I should do so,' Sherlock Holmes remarked impatiently.

I think that I had better go, Holmes." "Not a bit, doctor. Stay where you are. I am lost without my Boswell.

It is decreed by a merciful Nature that the human brain cannot think of two things simultaneously . . .

We surely know by some nameless instinct more about our futures than we think we know.

So swift, silent and furtive were his movements like those of a trained bloodhound picking out a scent, that I could not but think what a terrible criminal he would have made had he turned his energy and sagacity against the law instead of exerting them in its defense. -Dr. Watson, The Sign of the Four

You never tire of the moor. You cannot think the wonderful secrets which it contains. It is so vast, and so barren, and so mysterious.

Indeed, I cannot think why the whole bed of the ocean is not one solid mass of oysters, so prolific the creatures seem. Ah, I am wandering! Strange how the brain controls the brain! What was I saying, Watson?