4 ideas
18758 | Validity is provable, but invalidity isn't, because the model is infinite [Church, by McGee] |
15640 | Courage is not a virtue, but the form of every virtue at its testing point [Lewis,CS] |
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] |