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Monday, July 16, 2012

0234: The Non-Contradictory Character of Being




Entry 0234: The Non-Contradictory Character of Being 

Common expressions of the non-contradictory character of being:

1. “What exists cannot not exist.”

2. “Whatever exists exists and cannot not exist.”

3. “That which exists cannot not exist and that which does not exist cannot exist.”

4. “That which is, is; and that which is not, is not.”

5. “It is impossible for a thing to exist and not exist at the same time.”

6. “Id quod est praesens, non potest non esse praesens,” (Summa Theologiae, I-II, 39, 3, c).

7. “Quod est, necesse est esse quando est,” (De Veritate, 2, 12, ad 2).