What does the Bible say about prayer and God's promises?

The Bible teaches that while God is sovereign and has decreed all that will come to pass, He has also ordained that His people actively seek Him through prayer. In 1 Kings 18, Elijah, despite knowing God's promise to send rain, persistently prayed for it to happen. This illustrates that prayer is not only a means of communication with God but also a way to engage in His purposes, reflecting our faith and dependence on His divine timing and will. Therefore, we should pray for what the Lord has promised, waiting eagerly for its fulfillment.