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No experiment can be more interesting than that we are now trying, and which we trust will end in establishing the fact, that man may be governed by reason and truth. Our first object should therefore be, to leave open to him all the avenues to truth. The most effectual hitherto found, is the freedom of the press. It is, therefore, the first shut up by those who fear the investigation of their actions.
--
Letter to Judge John Tyler (June 28, 1804); in: The Writings of Thomas Jefferson, Memorial Edition (ME) (Lipscomb and Bergh, editors), 20 Vols., Washington, D.C., 1903-04, Volume 11, page 33.

 

Thomas Jefferson

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Each piece, or part, of the whole nature is always an approximation to the complete truth, or the complete truth so far as we know it. In fact, everything we know is only some kind of approximation, because we know that we do not know all the laws as yet. Therefore, things must be learned only to be unlearned again or, more likely, to be corrected.......The test of all knowledge is experiment. Experiment is the sole judge of scientific “truth”.

 

Richard Feynman

 

A difficulty in seeking Truth is the notion that certain men are ordained of heaven to seek Truth for all mankind and that we are to accept their acquisitions in the place of seeking for ourselves. We can never attain Truth by proxy. By divine ordination every man is an original investigator of Truth. He denies his own reason who hands over his religious views and opinions to any priest or religious teacher… We are to accept nothing on the opinions of others. What another man has thought and believed, what a Church Council or synod has formulated is nothing to me, only that it may be a reason for personal investigation ending in acceptance or rejection as I may find it in harmony with reason and well established truth.

 

Benjamin Fish Austin

 

We must trust to nothing but facts: These are presented to us by Nature, and cannot deceive. We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation.

 

Antoine Lavoisier

 

Above all our thought should be empty, waiting, not seeking anything, but ready to receive in its naked truth the object that is to penetrate it.
All wrong translations, all absurdities in geometry problems, all clumsiness of style, and all faulty connection of ideas in compositions and essays, all such things are due to the fact that thought has seized upon some idea too hastily, and being thus prematurely blocked, is not open to the truth.

 

Simone Weil

 

A theoretical investigation which Einstein published in 1917 provides a third conspicuous landmark. It connected up he two great landmarks already mentioned by showing that the disintegration of radioactive substances is governed by the same laws as the jumps of the kangaroo electrons in the theory of Bohr. In fact radioactive atoms were now seen merely to contain a special breed of kangaroos, much more energetic and ferocious than any that had hitherto been encountered.

 

James Jeans