This quote is commonly attributed to Albert Einstein, especially in:

"The only reason for time is so that everything doesn't happen at once."    

However, there are many cases of quotes misattributed to Einstein. There are many sources that use this quote, and it's quite popular in image form (as shown by a simple Google Image search). There is no mention of it on Albert Einstein's Wikiquote page, which is otherwise pretty thorough, from what I can see.

What evidence is there that Einstein really said this?

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    $\begingroup$ I'm putting this question on hold because is has been (multi-)cross-posted to other SE sites, where it has already received an answer. The question was originally answered here. Do not cross-post questions, please. If you think your question isn't at place on the original site where you posted it, flag it for migration, don't post it again! $\endgroup$ – Danu Oct 13 '15 at 14:18
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    $\begingroup$ Cross-posted on Physics, History and Skeptics. $\endgroup$ – HDE 226868 Oct 13 '15 at 15:31
  • $\begingroup$ "Time is a Runic Rhyme" -- Edgar Allan Poe $\endgroup$ – K7PEH Oct 13 '15 at 16:42