logic Quotes

We ought to be able to persuade on opposite sides of a question; as also we ought in the case of arguing by syllogism: not that we should practice both, for it is not right to persuade to what is... ...

Accordingly, the poet should prefer probable impossibilities to improbable possibilities. The tragic plot must not be composed of irrational parts.

One cannot say of something that it is and that it is not in the same respect at the same time.

We do not know a truth without knowing its cause.

The probable is what usually happens.

Finally, if nothing can be truly asserted, even the following claim would be false, the claim that there is no true assertion.

Of the modes of persuasion furnished by the spoken word there are three kinds. The first kind depends on the personal character ofthe speaker; the second on putting the audience into a certain frame of mind; the third on the... ...

If then it be possible that one contrary should exist, or be called into existence, the other contrary will also appear to be possible.

Everything necessarily is or is not, and will be or will not be; but one cannot divide and say that one or the other is necessary.I mean, for example: it is necessary for there to be or not to be... ...

Things that are probably impossible are better than things that are improbably possible.