Full Idea
The sun doesn't become bright when it emerges from the clouds; it always is bright.
Gist of Idea
The sun is always bright; it doesn't become bright when it emerges
Source
Plutarch (26: Oracles in Decline [c.85], §39)
Book Reference
Plutarch: 'Selected Essays and Dialogues', ed/tr. Russell,Donald [OUP 1993], p.46
A Reaction
Not an argument, but a nice appeal to common sense, like Russell's example of the cat that disappears behind the furniture and then reappears. To disagree with Plutarch here strikes me as the road to philosophical absurdity.