The Bunyan imagery well represents our position in the spirit. We are far more powerful in prayer than we may perceive.
Another metaphor that has been helpful to me: I like the idea of a clap: an impact. The heavens declare… let the earth resound. Perhaps it is the agreement of God and man that brings change to the Earth. We are restored in the new Adam, to our place as Adam – president. And in such, I believe that our voice and agreement is made significant.
There are times when prayer seems less than effective, particularly when I am asking for something or someone outside of myself. But, even in such scenarios, I find myself changed in the understanding of my own heart if not the heart of the other person. And many times God will show me a portion of what He is doing, altering in the processes seen and unseen.
Praying has become so much more about watching for me: listening, hearing, trusting, and understanding what my role is and what is God’s role. I am to listen and speak. God speaks, waits to hear His echo and then moves.