Babies and the old are permitted self-absorption. In between, it provokes resentment.
A: Everything changes. B: But not enough.
Alone, lonely people talk to themselves. In company, they often continue.
Frivolous sorrow is folly. Frivolous enjoyment is not.
Theory can leave questions unanswered, but practice has to come up with something.
In the present age, a man with harmonious ideas is regarded as out of touch.