Arthur Conan Doyle Quotes

Arithmetic is where the content lies, and not logic; but logic prompts certainty, and not arithmetic.

You can only find truth with logic if you have already found truth without it.

Intuition does not in itself amount to knowledge, yet cannot be disregarded by philosophers and psychologists.

If all you have is faith, then you never actually know anything.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

A very great deal more truth can become known than can be proved.

It is by logic we prove. It is by intuition we discover.

Did they know why they knew? Not at all. But the Knew!

Belief sometimes precedes understanding; faith sometimes precedes scientific evidence.

The things of which we want the proof are those we know the best.

Logic is the foundation of the certainty of all the knowledge we acquire.

We do not know a truth without knowing its cause.

Every science in a certain degree starts from faith, and, on the contrary, faith, which does not lead to science, is mistaken faith or superstition, but real, genuine faith it is not.

Not to know of what things one should demand demonstration, and of what one should not, argues want of education.

To argue that the gaps in knowledge which confront the seeker must be filled, not by patient inquiry, but by intuition or revelation, is simply to give ignorance a gratuitous and preposterous dignity.

Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowledge.

Common Sense is that which judges the things given to it by other senses.

The word 'belief' is a difficult thing for me. I don't believe. I must have a reason for a certain hypothesis. Either I know a thing, and then I know it - I don't need to believe it.

The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.

Human knowledge is dark and uncertain; philosophy is dark, astrology is dark, and geometry is dark.

When we examine the opinions of men, we find that nothing is more uncommon than common sense; or, in other words, they lack judgment to discover plain truths or to reject absurdities and palpable contradictions.

I hate facts. I always say the chief end of man is to form general propositions - adding that no general proposition is worth a damn.

I don't believe that you have to be a cow to know what milk is.

It is through science that we prove, but through intuition that we discover.

Common sense is not so common.