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In art, truth is a means to an end; in science, it is the only end.
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It is a test of true theories not only to account for but to predict phenomena.
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A man really and practically looking onwards to an immortal life, on whatever grounds, exhibits to us the human soul in an enobled attitude.
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Gold and iron at the present day, as in ancient times, are the rulers of the world; and the great events in the world of mineral art are not the discovery of new substances, but of new and rich localities of old ones.
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Astronomy is ... the only progressive Science which the ancient world produced.
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To discover the laws of operative power in material productions, whether formed by man or brought into being by Nature herself, is the work of a science, and is indeed what we more especially term Science.
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There is a mask of theory over the whole face of nature.
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We cannot observe external things without some degree of Thought; nor can we reflect upon our Thoughts, without being influenced in the course of our reflection by the Things which we have observed.
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Every failure is a step to success.
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Conscience is the reason employed about questions of right and wrong.
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Our assent to the hypothesis implies that it is held to be true of all particular instances. That these cases belong to past or to future times, that they have or have not already occurred, makes no difference in the applicability of the rule to them. Because the rule prevails, it includes all cases.