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 principles and admitted truths. These may be infallibly persuasive; for in showing the harmony which they have with acknowledged principles there is an inevitable necessity of conviction, and it is impossible that they shall not be received into the soul as soon as it has been enabled to class them among the principles which it has already admitted.

There are some which have a close connection with the objects of our satisfaction; and these again are received with certainty, for as soon as the soul has been made to perceive that a thing can conduct it to that which it loves supremely, it must inevitably embrace it with joy.

But those which have this double union both with admitted truths and with the desires of the heart, are so sure of their effect that there is nothing that can be more so in nature. As, on the contrary, that which does not accord either with our belief or with our pleasures is importunate, false, and absolutely alien to us.

In all these positions, there is no room for doubt. But there are some wherein the things which it is sought to make us believe are well established upon truths which are known, but which are at the same time contrary to the pleasures that interest us most. And these are in great danger of showing, by an experience which is only too common, what I said at the beginning—that this imperious soul, which boasted of acting only by reason, follows by a rash and shameful choice the desires of a corrupt will, whatever resistance may be opposed to it by the too enlightened mind.

Then it is that a doubtful balance is made between truth and pleasure, and that the knowledge of the one and the feeling of the other stir up a combat the success of which is very uncertain, since, in order to judge of it, it would be necessary to know all that passes in the innermost spirit of the man, of which the man himself is scarcely ever conscious.

It appears from this, that whatever it may be of which we wish to persuade men, it is necessary to have regard to the person whom we wish to persuade, of whom we must know the mind and the heart, what principles he acknowledges, what things he loves; and then observe in the thing