Is it farther or further?

set one's mind at rest

Also, put one's mind at rest . Stop worrying, allay one's anxiety. For example, Your car's been found undamaged, so set your mind at rest . Also see lay at rest
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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