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Cliquer sur les phrases pour les voir dans leur contexte. Les textes de Immanuel Kant et David Hume sont disponibles auprès du Projet Gutenberg.

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A peasant can give no better reason for the stopping of any clock or watch than to say, that commonly it does not go right: But an artizan easily perceives, that the same force in the spring or pendulum has always the same influence on the wheels; but fails of its usual effect, perhaps by reason of a grain of dust, which puts a stop to the whole movement.

 Such would be the reasonings of our speculative philosopher: But I am persuaded, that if he had not a perfect knowledge of human nature, he would be apt to regard them as mere chimerical speculations, and would consider the infamy attending infidelity, and backwardness to all its approaches, as principles that were rather to be wished than hoped for in the world. But still I can see no pretext of reason for asserting, that the tendency to cause such an error is the first spring or original source of all immorality. 
These assertions have the following peculiarities; They can find neither confirmation nor confutation in experience; and each is in itself not only self-consistent, but possesses conditions of its necessity in the very nature of reason--only that, unluckily, there exist just as valid and necessary grounds for maintaining the contrary proposition.
 The success which attends the efforts of reason in the sphere of mathematics naturally fosters the expectation that the same good fortune will be its lot, if it applies the mathematical method in other regions of mental endeavour besides that of quantities.  But in order to bestow on this system its full force and evidence, we must carry our eye from it a moment to consider its consequences, and explain from the same principles some other species of reasoning, which are derived from the same origin.