Don't think. That is the wrong way to bring anything back. Let it go. Sooner or later it will flash into your mind.
One place is very like another.
The past is the father of the present.
What good is money if it can't buy happiness?
Our weapon is our knowledge. But remember, it may be a knowledge we may not know that we possess.
I have often had occasion to notice how, where a direct question would fail to elicit a response, a false assumption brings instant information in the form of a contradiction.