I came across this quote from Japanese sources:

"人生は活動の中にあり、貧しき休息は死を意味する"

Which can be translated into:

"Life is about performing actions, therefore resting is the same as being dead".

This seems to be frequently quoted in Japanese media and it's widely attributed to Voltaire wherever I found it, however I couldn't find the original sentence anywhere or its official English translation.

The closest thing I could find was:

"Repose is a good thing, but boredom is its brother."

But that would make the Japanese version quite a free interpretation. Moreover I still couldn't find the original in French.

Does anyone have any insight of what this could come from?