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 be convicted of falsehood as soon as they shock already received opinions in the slightest degree; as if the respect that we have for the ancient philosophers were a duty, and that which we bear to the most ancient of the Fathers solely a matter of courtesy! I leave it to judicious persons to remark the importance of this abuse which perverts the order of the sciences with so much injustice; and I think that there will be few who will not wish that this liberty might be applied to other matters, since new inventions are infallible errors in the matters which we profane with impunity; and since they are absolutely necessary for the perfection of so many other subjects incomparably lower, which nevertheless we dare not approach.

Let us divide our credulity and suspicion with more justice, and limit this respect we have for the ancients. As reason gives it birth, she ought also to measure it; and let us consider that if they had continued in this restraint of not daring to add any thing to the knowledge which they had received, or if those of their times had made the like difficulty in receiving the novelties which they offered them, they would have deprived themselves and their posterity of the fruit of their inventions.

As they only made use of that which had been bequeathed to them as a means whereby to gain more, and as this happy daring opened to them the way to great things, we should take that which they acquired in the same manner, and by their example, make of it the means and not the end of our study, and thus strive while imitating to surpass them.

The secrets of nature are concealed; although she is continually working, we do not always discover her effects: time reveals them from age to age, and although always alike in herself she is not always alike known.