There never comes a point where a theory can be said to be true. T

There never comes a point where a theory can be said to be true. The most that one can claim for any theory is that it has shared the successes of all its rivals and that it has passed at least one test which they have failed. – Sir Alfred Jules Ayer

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The world can doubtless never be well known by theory: practice is absolutely necessary; but surely it is of great use to a young man, before he sets out for that country, full of mazes, windings, and turnings, to have at least a general map of it, made by some experienced traveler. – Lord Chesterfield

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Assumptions

I never guess. It is a shocking habit — destructive to the logical faculty. – Sir Arthur Conan Doyle

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Theories are always very thin and insubstantial, experience only is tangible. – Hosea Ballou

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Assumptions

It is theory that decides what can be observed. – Albert Einstein

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