True knowledge comes with deep understanding of a topic and its inner workings.
People start their lives at last when they are able to live for something other than themselves.
He who can no longer pause to wonder and stand rapt in awe, is as good as dead; his eyes are closed.
What you can't imagine, you can't discover.
You can't solve problems with the same thinking that caused them.
Logic will get you from A to B. Imagination will take you everywhere.