Bhagavad Gita, Chapter 11, Verse 12

If the splendour of a thousand suns were to rise up at once in the sky, that would be like the splendour of that Mighty Being.

Even the brightest thing anyone could imagine is offered here only as a rough, real comparison, not a match.

A thousand suns blazing together still falls short of what's actually being described. Real splendor here is shown as beyond any single earthly image.