8 ideas
| 7661 | Truth is the opinion fated to be ultimately agreed by all investigators [Peirce] |
| 19089 | Our whole conception of an object is its possible practical consequences [Peirce] |
| 7660 | We are aware of beliefs, they appease our doubts, and they are rules of action, or habits [Peirce] |
| 9155 | An a priori proof is independent of experience [Leibniz] |
| 2602 | What experience could prove 'If a=c and b=c then a=b'? [Descartes] |
| 2600 | The mind's innate ideas are part of its capacity for thought [Descartes] |
| 2601 | Qualia must be innate, because physical motions do not contain them [Descartes] |
| 14906 | Non-positivist verificationism says only take a hypothesis seriously if it is scientifically based and testable [Ladyman/Ross on Peirce] |