4 ideas
19440 | How do you know you have conceived a thing deeply enough to assess its possibility? [Vaidya] |
9807 | In pursuing truth, anything less certain than mathematics is a waste of time [Descartes] |
13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |