The Power of Prayer

Then shalt thou call, and the Lord shall answer; thou shalt cry, and he shall say, Here I am. If thou take away from the midst of thee the yoke, the putting forth of the finger, and speaking vanity; (Isaiah 58:9)

If I regard iniquity in my heart, the Lord will not hear me: 19 But verily God hath heard me; he hath attended to the voice of my prayer. (Psalm 66:18-19)

He shall call upon me, and I will answer him: I will be with him in trouble; I will deliver him, and honour him. (Psalm 91:15)

We can learn something very important here. There is a solid logical argument from these texts; I'm not sure what to call it: thesis, antithesis, synthesis; something to do with that. What I'm getting at is this: Jehovah states in one place that when I obey him, he will listen to me. The Scriptures teach in the Psalms that when I refuse to obey him, he will not listen to me. So it is solid, it goes both ways: Jehovah listens to those who obey him and them only.
What does it mean for Jehovah to listen to a man? God knows better than you or I, so why would he ever listen to us? I guess it's like the way I want to agree to things that those I love suggest even when I am sure I know better. But I don't quite understand how God who knows all and does no wrong might be similar to this.
I think we are sometimes a bit too deist in our thinking. We think of God as a force in the universe rather than a person with feelings. The verse before the Psalm 91 passage gives the reason for God's listening as: because he has set his love on me. God wants us to love him, how can he be without emotions?
So is there any use in God listening to me?
And I sought for a man among them, that should make up the hedge, and stand in the gap before me for the land, that I should not destroy it: but I found none. (Ezekiel 22:30)
Yes, I can hold back his judgment and free him to show mercy. What a responsibility!

I love God, so I will ask God to give me more love for him and his creation, and he will listen to me. It is my task to believe that he has answered my prayer whatever I may feel.