A personal example. As a child I had a fascination with the weather, outer space, our evironment and all things natural. I often devoured information about the creation of the universe on down to the creation of human beings, soaking up the information as only a child's mind could. One such thing I could always remember was that I was completely enraptured by tornados. Whenever I could I would watch an educational program on The Learning Channel about tornados, or check out books on weather in my elementary school library. Whenever the weather grew into a storm in my town, I sometimes could recognize potential tornado activity. As much as I was fascinated by them, the sheer awe that accompanied them also caused me fear. They cannot be predicted accurately, and seated within that uncertainty the fear manifests. So too does all of mother nature and our universe place limits on our knowledge and ability to know exactly how things happen around us.
The need to know is rather remarkable in human kind, that which we strive to identify in our daily lives will consume many of us until our dying days. However, even more remarkable that despite the fact that we fear the unknown and seek to achieve mastery over it, we create deities who are absolutely riddled with unknowns, so open to interpretation that while one can claim to have achieved knowledge and mastery over it it is truly no more correct than any other person's perspective.
Perhaps then, that is the end of the equation. Knowledge is power against the unknown. The unknown is something we fear. Thus, we try to conquer the unknown. In doing so we will create a situation for ourselves where the unknown is ultimately just simply a point of view that can either be regarded as something to fear, or something to anticipate. Perspective can be manipulated, as can knowledge, and thus all power knowledge has is lost. Therefore, believing that knowledge is the key to all power is incorrect, and rather believing that the highest power for overcoming fear of the unknown is our perspective and our own willingness to believe that our knowledge is sufficient for now (until the next revelation).