God gives power to accomplish purpose. He knows what He wants. He tells us what He wants. He finds a people who will get Him what He wants, and empowers them to fulfill His purpose.
Perfect release on His part. Perfect focus on His part. Perfect power on His part.
We imperfectly receive, struggle with focus, and release limited power. We are often too full of other things to be full of His purpose. We are often too distracted by other things to focus on His purpose. And, consequently, the power we do receive, unfocused, is limited in its release.