Triumphant prayer is almost impossible where there is neglect of the study of the Word of God.

R. A. Torrey (Writer, 1856 – 1928)

I have personally found this to be true. How do you know what the LORD wants you to pray for and if it is His will unless you study the Word of God (The Holy Bible). If you pray for the things that God tells you He cares about, then you are bound to have success. Like praying for someone to come to Christ.