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2 ideas
| 2252 | Surely maths is true even if I am dreaming? [Descartes] |
| Full Idea: Surely whether I am asleep or awake, two plus three makes five, and a square does not have more than four sides. | |
| From: René Descartes (Meditations [1641], §1.20) |
| 2430 | I can learn the concepts of duration and number just from observing my own thoughts [Descartes] |
| Full Idea: When I think that I exist now, and recollect that I existed in the past, and when I conceive various thoughts, the number of which I know, then I acquire the ideas of duration and number which I can thereafter transfer to all the other objects I wish. | |
| From: René Descartes (Meditations [1641], §3.44) |