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The Principle of Contradiction: 8 things everyone should know
TFP Student Action ^ | 10-04-12 | TFP

Posted on 10/05/2012 8:54:00 AM PDT by concernedAmerican1

What is the principle of contradiction? In a nutshell, it’s this:  a thing cannot be and not be at the same time.  Saint Thomas Aquinas shows that not even God can deny the principle of contradiction, the absolute law of the order of being, because it is impossible for God to will the absolutely impossible (Summa Contra Gentiles, Book 1, chap. 84).

Father Garrigou-Lagrange gives us eight principal reasons, based on Aristotle, for defending the necessity and real validity of the principle of contradiction. They are briefly:

1. To deny this necessity and this validity would be to deprive words of their fixed meaning and to render speech useless;

2. All idea of the reality of an essence, or thing or substance as such, would have to be abandoned; there would be only a becoming without anything which is on the way of becoming; it would be like saying that there can be a flux without a fluid, a flight without a bird, a dream without a dreamer;

3. There would no longer be any distinction between things, between a galley, a wall, and man;

4. It would mean the destruction of all truth, for truth follows being;

5. It would destroy all thought, even all opinion; for its very affirmation would be a negation.

6. It would mean the destruction of all desire and all hatred; there would be only absolute indifference, for there would be no distinction between good and evil; there would be no reason why we should act;

7. It would no longer be possible to distinguish degrees of error; everything would be equally false and true at the same time;

8. It would put an end to the very notion of becoming; between the beginning and the end of a movement; the first would already be the second, and any transition from one state to another would be impossible.  Moreover, “becoming” could not be explained by any of the four causes.  There would be no subject of becoming; the process would be without any efficient or final cause, and without specification, and it would be both attraction and repulsion, concretion as well as fusion.

(Rev. R. Garrigou-Lagrange, God: His Existence and His Nature, B. Herder Book Co., St. Louis, 1934, vol. 1, p. 1680)


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TOPICS: Apologetics; Catholic; History; Theology
KEYWORDS: contradiction; logic; principle; reason

1 posted on 10/05/2012 8:54:07 AM PDT by concernedAmerican1
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To: concernedAmerican1

I’m just a simple man. But this seems like a contradiction.


2 posted on 10/05/2012 8:58:30 AM PDT by BipolarBob (G Orwell was an optimist it seems.)
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To: concernedAmerican1

Perhaps Aquinas was wrong?


3 posted on 10/05/2012 9:01:04 AM PDT by stuartcr ("When silence speaks, it speaks only to those that have already decided what they want to hear.")
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To: stuartcr

Hmmmm, maybe not. Perhaps its simply poorly translated; its not a “contradiction” it’s a paradox. (I think).


4 posted on 10/05/2012 9:04:02 AM PDT by Rich21IE
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To: Rich21IE
Q: What is a paradox?

A: Two dox!

5 posted on 10/05/2012 9:08:32 AM PDT by sportutegrl
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To: concernedAmerican1

Good article. It is a very good thing to get back to first principles.


6 posted on 10/05/2012 9:36:21 AM PDT by arrogantsob (The Disaster MUST Go. Sarah herself supports Romney.)
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To: stuartcr; concernedAmerican1

If Aquinas is in error then hypocrisy and sophisty are statements of fact that are at the same time not statements of fact.


7 posted on 10/05/2012 9:48:50 AM PDT by spirited irish
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To: concernedAmerican1

I’m always amused by the slogan used in commercials for our State lottery: “You can’t win if you don’t play.”

It’s also true that you can’t lose if you don’t play. There’s no contradiction here between what SEEM to be opposite statements.


8 posted on 10/05/2012 10:18:53 AM PDT by earglasses (I was blind, and now I hear...)
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To: Rich21IE

Could be. It’s hard to know what goes on in another’s mind, especially someone in the past.


9 posted on 10/05/2012 10:47:11 AM PDT by stuartcr ("When silence speaks, it speaks only to those that have already decided what they want to hear.")
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To: spirited irish

For us humans it certainly is, but we’re not God.


10 posted on 10/05/2012 10:48:59 AM PDT by stuartcr ("When silence speaks, it speaks only to those that have already decided what they want to hear.")
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To: stuartcr

Even for God some things are impossible. He can not be wrong. He cannot be perfect. He cannot be evil. He cannot not know something. He cannot violate His own laws.


11 posted on 10/05/2012 11:26:49 AM PDT by Secret Agent Man (I can neither confirm or deny that; even if I could, I couldn't - it's classified.)
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To: concernedAmerican1

I am a liar. Everything I say is a lie!


12 posted on 10/05/2012 12:56:49 PM PDT by irishtenor (Everything in moderation, however, too much whiskey is just enough... Mark Twain)
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To: Rich21IE

A paradox is different. In spiritual terms it could be: “In order to win you must surrender.” Or to become who you really are you have to die to yourself...

A contradiction in Acquinas’s context is like: a square circle; a married bachelor. It is nonsense.


13 posted on 10/05/2012 3:50:47 PM PDT by D-fendr (Deus non alligatur sacramentis sed nos alligamur.)
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To: Secret Agent Man

Those laws are really only what we think. ..Perhaps what we perceive as contradictory or no possible, just are the same to God.


14 posted on 10/07/2012 8:17:54 PM PDT by stuartcr ("When silence speaks, it speaks only to those that have already decided what they want to hear.")
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To: Secret Agent Man

Those laws are really only what we think. ..Perhaps what we perceive as contradictory or no possible, just are the same to God.


15 posted on 10/07/2012 8:18:01 PM PDT by stuartcr ("When silence speaks, it speaks only to those that have already decided what they want to hear.")
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To: stuartcr

Sorry, should be...Those laws are really only what we think they are, perhaps what we perceive as contradictory or not possible, just aren’t the same to God.


16 posted on 10/09/2012 6:29:38 AM PDT by stuartcr ("When silence speaks, it speaks only to those that have already decided what they want to hear.")
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