There are two ways of holding an idea. One is with a closed fist, and one is with an open palm.
When you hold an idea in a closed fist, you control it. It is yours. And no one else can access it. Ideas held tightly — as if in a fist — can’t be seen. Sure, if you try really hard, you might be able to see the little bits between the cracks. But they’re hard to see, share — or steal.