He wants to know what happened to put his own mind at rest.
Until the war is through, you must put your mind to nothing else.
She put her fine new mind to work on the problem.
If I have done so, you may well put your own mind at rest.
So put your mind to the information you have already.
A time later he put his mind back to business.
So I just wanted to put everyone's mind at rest.
He put his mind back to the matter at hand.
You can put your mind to anything and get it done.
He tried to put his mind on the business of going to sleep.
Idiome