But nature guards her greatest secrets well; to such places men must come to find them.

I was about to tell him one of my nation's greatest secrets.

Of the greatest secret in the universe, which was life itself, I knew practically nothing.

That was the greatest and most terrible secret of all.

The greatest secret in the world, and you put off learning it.

Today, we'll talk about perhaps the greatest secret of them all.

These three strangers may have stumbled upon the greatest secret in human history.

It is you to whom we have brought the single greatest secret of the universe.

And then suddenly you're sitting on the greatest secret of the war.

I don't know anything about the greatest secret in the galaxy.