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Updated: June 19, 2025
With this response, somewhat more tart than agreeable, the nobles were obliged to content themselves, and they accordingly took their leave. It must be confessed that they had been disposed to slide rather cavalierly over a good deal of ground towards the great object which they had in view. Certainly the petitio principii was a main feature of their logic.
To say that this is proved by the past experience of the race, is what logicians call a petitio principii it is assuming the whole point at issue. It is the same argument which our grandfathers would have used against aerial navigation no one had ever travelled in the air, and that proved that no one ever could.
So naked and unashamed an example of petitio principii would disgrace a debater in a pinafore. And these wonder-mongers have the incredible effrontery to babble of "logic"! Why, if one of them were to meet a syllogism in a lonely road he would run away in a hundred and fifty directions as hard as ever he could hook it. One is almost ashamed to dispute with such intellectual cloudings.
He saw the petitio principii which is inherent in every syllogism, if we consider the major to be itself the evidence by which the conclusion is proved, instead of being, what in fact it is, an assertion of the existence of evidence sufficient to prove any conclusion of a given description. Seeing this, Dr.
And since in reality we explain the Universe neither better nor worse with this idea than without it, the idea of God, the supreme petitio principii, is valueless.
The question "Does civilization civilize?" is a fine example of petitio principii, and decides itself in the affirmative; for civilization must needs do that from the doing of which it has its name.
If the deduced conclusion can be verified in fact, the premisses grow more assured. Thus every real inference is an experiment, and 'proof' is an affair of continuous trial and verification not an infinite falling back upon an elusive 'certainty, but an infinite reaching forwards towards a fuller consummation. It is inevitably a petitio principii.
It furnishes her with the petitio principii that man is under an ethical obligation to give anything she chooses to ask. We come next and this is the last of all the arguments we have to consider to the argument that the suffrage ought to be given to woman for instructional purposes.
The most effectual way, in fact, of exposing a petitio principii, when circumstances allow of it, is by challenging the reasoner to prove his premises; which if he attempts to do, he is necessarily driven into arguing in a circle.
Hence this is a petitio principii, a begging of the question. If this were all that M. Leibnitz had to offer, he might as well have believed, and remained silent. But this was not all. He endeavours to show, that the world is absolutely perfect, without inferring its perfection from the assumed infinite perfection of its Author.
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