Thinking is a function of your mind. Knowing encompasses all you are.
What you think can change at any moment, but what you know is always a part of you. Thinking is powerful. Knowing is even more so. There is no doubt about what you know, it has the clear, powerful presence of truth. Knowing comes from experience, guided by purpose. Know that you can do anything, that you can be anything, and that you can experience it all.