This is from Ray Pritchard from a blog titled: “If God Is Sovereign, Why Pray?”
Reason 2: We don’t know what we really need (Romans 8:26).
Reason 3: God knows what we need before we ask Him (Matthew 6:8).
Reason 4: We don’t pray to inform God about anything (Psalm 147:4).
Reason 5: We pray to express our total dependence upon our Heavenly Father.
Reason 6: We pray because God is honored by our persistent faith (Luke 18:1-8).
Reason 7: We pray because He’s God and we’re not.
Reason 8: We’re to give God no rest (Isaiah 62:6-7).