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Cease negative mental chattering. — If you think a thing is impossible, you'll make it impossible. Pessimism blunts the tools you need to succeed.
--
p. 121

 

Bruce Lee

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It does not make sense. It cannot exist. It’s impossible, and if it isn’t impossible, it’s irrelevant, and if it isn’t either of those things, it’s embarrassing.

 

Philip Pullman

 

Do you believe it to be impossible that God is infinite, without parts?—Yes. I wish therefore to show you an infinite and indivisible thing. It is a point moving everywhere with an infinite velocity; for it is one in all places, and is all totality in every place. Let this effect of nature, which previously seemed to you impossible, make you know that there may be others of which you are still ignorant. Do not draw this conclusion from your experiment, that there remains nothing for you to know; but rather that there remains an infinity for you to know. 231

 

Blaise Pascal

 

According to each one of the different theories there are things which are impossible, whose existence cannot be admitted, and whose creation is excluded from the power of God, and the assumption that God does not change their nature does not imply weakness in God, or a limit to his power. Consequently things impossible remain impossible, and do not depend on the action of an agent. It is now clear that a difference of opinion exists only as to the question to which of the two classes anything belongs; whether to the class of the impossible, or to that of the possible. Note it.

 

Maimonides

 

The round-square may be impossible, but we believe in it because it is impossible. [E.E.] Cummings is a very great expert in all these, so to speak, illegal syntactical devices: his misuse of parts of speech, his use of negative prefixes, his word-coining, his systematic relation of words that grammar and syntax don’t permit us to relate—all this makes him a magical bootlegger or moonshiner of language, one who intoxicates us on a clear liquor no government has legalized with its stamp.

 

Randall Jarrell

 

It is not unscientific to make a guess, although many people who are not in science think it is. Some years ago I had a conversation with a layman about flying saucers — because I am scientific I know all about flying saucers! I said “I don’t think there are flying saucers”. So my antagonist said, “Is it impossible that there are flying saucers? Can you prove that it’s impossible?” “No”, I said, “I can’t prove it’s impossible. It’s just very unlikely”. At that he said, “You are very unscientific. If you can’t prove it impossible then how can you say that it’s unlikely?” But that is the way that is scientific. It is scientific only to say what is more likely and what less likely, and not to be proving all the time the possible and impossible. To define what I mean, I might have said to him, "Listen, I mean that from my knowledge of the world that I see around me, I think that it is much more likely that the reports of flying saucers are the results of the known irrational characteristics of terrestrial intelligence than of the unknown rational efforts of extra-terrestrial intelligence." It is just more likely. That is all.

 

Richard Feynman