My mind," he said, "rebels at stagnation. Give me problems, give me work, give me the most abstruse cryptogram or the most intricate analysis, and I am in my own proper atmosphere. I can dispense then with artificial stimulants. But I abhor the dull routine of existence. I crave for mental exaltation. That is why I have chosen my own particular profession, or rather created it, for I am the only one in the world.

Of all ruins, that of a noble mind is the most deplorable.

Amberley excelled at chess - a mark, Watson, of a scheming mind.

There are no fools so troublesome as those of the mind