9 ideas
| 8406 | Not all explanations are causal, but if a thing can be explained at all, it can be explained causally [Sanford] |
| 20180 | A happy and joyous life must largely be a quiet life [Russell] |
| 20178 | Life is now more interesting, but boredom is more frightening [Russell] |
| 20176 | Boredom is an increasingly strong motivating power [Russell] |
| 20177 | Boredom always involves not being fully occupied [Russell] |
| 20179 | Happiness involves enduring boredom, and the young should be taught this [Russell] |
| 1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
| 8407 | A totality of conditions necessary for an occurrence is usually held to be jointly sufficient for it [Sanford] |
| 5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |