7 ideas
| 16519 | No one can conceive of a possible substance, apart from those which God has created [Arnauld] |
| 16629 | By comparing qualities and features, reason can gradually infer the nature of substance [Grosseteste] |
| 20180 | A happy and joyous life must largely be a quiet life [Russell] |
| 20177 | Boredom always involves not being fully occupied [Russell] |
| 20179 | Happiness involves enduring boredom, and the young should be taught this [Russell] |
| 20176 | Boredom is an increasingly strong motivating power [Russell] |
| 20178 | Life is now more interesting, but boredom is more frightening [Russell] |