Of course, we are! The problem is that we don't seem to realize it. We let ourselves be convinced that the random thoughts created by past experiences have more power than we do. So we give in to them. We think it's some spirit whispering in our ear or our intuition. It is in fact a bunch of baloney!
If we want to do something, AND if we move our feet to accomplish the things or the training necessary in the physical world, AND if we don't let the "voices in our heads" get in the way of our rational thought processes, AND if we don't give up, we can take charge of our minds and accomplish wondrous things. In that process, we are changed because we now know we have the power within us to reach for the goals we desire in our lives.
Looking at the picture accompanying this post, I have to say that, in reality, our minds have more power than our hands because our mind directs our hands.