Quotes about Logic

a man investigating principles cannot argue with one who denies their existence.

WATSON: Then you are yourself inclining to the supernatural explanation.      HOLMES: if Dr. Mortimer's surmise should be correct, and we are dealing with forces outside the ordinary laws of Nature, there is an end of our investigation. But we are bound to exhaust all other hypotheses before falling back upon this one.

Mr. Sherlock Holmes...was usually very late in the mornings, save upon those not infrequent occasions when he was up all night.

Problems may be solved in the study which have baffled all those who have sought a solution by the aid of their senses.

I should have more faith. I ought to know by this time that when a fact appears to be opposed to a long train of deductions, it invariably proves to be capable of bearing some other interpretation.

I believe you are a wizard, Mr. Holmes.

It would be superfluous to drive us mad, my dear Watson, said he. A candid observer would certainly declare that we were so already before we embarked upon so wild an experiment.

His conclusions were as infallible as so many propositions of Euclid. So startling would his results appear to the uninitiated that until they learned the processes by which he had arrived at them they might well consider him as a necromancer.

It is a capital mistake to theorize in advance of the facts.

It is a capital mistake to theorize before you have all the evidence. It biases the

The emotional qualities are antagonistic to clear reasoning.

Crime is common. Logic is rare.