The Language of Scripture in Our Prayers

On page 162 of GPTG, the author encourages us to pray the language of scripture. I began to think about what a difference it would make in the lives of other believers if when I prayed for them I was also reassuring them with truths and promises that God Himself has offered. We talk alot about how as Christians we need to look to something beyond ourselves, God's Revelation, to establish truth and find ways to live and so on. If this is truly our desire, why aren't we praying that same Revalation as a way to communicate back with God?