15 ideas
| 291 | Don't assume that wisdom is the automatic consequence of old age [Plato] |
| 14782 | Philosophy is an experimental science, resting on common experience [Peirce] |
| 14787 | Self-contradiction doesn't reveal impossibility; it is inductive impossibility which reveals self-contradiction [Peirce] |
| 6021 | It is only when we say a proposition that we speak truly or falsely [Sext.Empiricus] |
| 14783 | Logic, unlike mathematics, is not hypothetical; it asserts categorical ends from hypothetical means [Peirce] |
| 6020 | 'Man is a rational mortal animal' is equivalent to 'if something is a man, that thing is a rational mortal animal' [Sext.Empiricus] |
| 14788 | Mathematics is close to logic, but is even more abstract [Peirce] |
| 14786 | Some logical possibility concerns single propositions, but there is also compatibility between propositions [Peirce] |
| 14789 | Experience is indeed our only source of knowledge, provided we include inner experience [Peirce] |
| 14785 | The world is one of experience, but experiences are always located among our ideas [Peirce] |
| 6026 | How can you investigate without some preconception of your object? [Sext.Empiricus] |
| 14784 | Ethics is the science of aims [Peirce] |
| 6032 | Right actions, once done, are those with a reasonable justification [Sext.Empiricus] |
| 293 | Being unafraid (perhaps through ignorance) and being brave are two different things [Plato] |
| 1517 | The tektraktys (1+2+3+4=10) is the 'fount of ever-flowing nature' [Sext.Empiricus] |