I also concur that Franklin Delano Roosevelt stated this. He made this comment to congress and was wanting congress to support his program that would supposedly assist our friend Great Britain in fighting against Hitler and his regime without directly involving American troops. This comment was made during World War 2.
Brainstorming can help in many different ways. But one reason is when you go over your essay (anything really) too fast you can easily miss the point. Hope this helps :)