God made us and redeemed us for fellowship with Himself, and prayer is an important part of that relationship. God speaks to us in and through the contents of the Bible, which the Holy Spirit opens up and applies to us and enables us to understand. We then speak to God about Himself, ourselves, and people in His world, shaping what we say as response to what He has said. This unique form of two-way conversation continues as long as life lasts. In petition the persons praying make their requests known to God, expressing their faith and dependence on Him for all things.
Petition is the dimension of prayer most often highlighted through the Bible.
This means invoking His mediation, as the One who secures our access to the Father, and looking to Him for support, as our intercessor in the Father's presence. But God knows what is best in a way that we do not, and He may deny our specific requests. In intercession, we represent to God the needs and concerns of others. In doing this we exercise God-given love for them. Moses is a model for such a prayer in the Old Testament.