Full Idea
If, for relaxation, one gives up discussing eternal things, it is pleasant to consider likely accounts of the world of change.
Gist of Idea
For relaxation one can consider the world of change, instead of eternal things
Source
Plato (Timaeus [c.362 BCE], 59c)
Book Reference
Plato: 'Timaeus and Critias', ed/tr. Lee,Desmond [Penguin 1971], p.84
A Reaction
To understand this, examine Plato's example of the Line at 'Republic' 509d.