Bill Thrasher, A Journey to Victorious Praying, Moody Publishers, 2003, p. 190-191.
Why has God chosen to work through persevering prayer? 1. To purify our desires. Sometimes we may want the right thing for the wrong reasons. 2. To prepare us for His answer. A premature answer might cause us to glory more in the gift than in the Giver. 3. To develop our life and character. We have already stated that one of God’s greatest priorities in prayer is the work He desires to do in us. 4. To be used of God in spiritual warfare. Although we are not told a great bit of detail about the exact nature of the angelic conflict in the heavenlies, we are told enough to be assured of the reality of it. 5. To bless us with a more intimate relationship with God. An aspect of delighting in a person is delighting in conversing with them. The joy of fellowship with a prized person is the greatest treasure.
Bill Thrasher, A Journey to Victorious Praying, Moody Publishers, 2003, p. 190-191.