3 ideas
23367 | Even pointing a finger should only be done for a reason [Epictetus] |
18189 | ZFC could contain a contradiction, and it can never prove its own consistency [MacLane] |
6672 | Moore's Paradox: you can't assert 'I believe that p but p is false', but can assert 'You believe p but p is false' [Moore,GE, by Lowe] |