In Luke 24:32 the disciples who had talked with Jesus on the Emmaus road, said, “Did not our hearts burn within us while he talked to us on the road, while he opened to us the Scriptures?” (RSV, emphasis added). The fire of the zeal for the Lord comes from the opening of the Scriptures in conversation with Jesus (that is, in Scripture soaked prayer).
Question: If you do not burn with the zeal that you long for, are you willing to make some experiments with high-dosage, extended-time, prayer-driven Bible meditation? Very honestly, there is in my own life a close correspondence between the time and amount of prayerful Bible opening, and the depth and strength and warmth of my zeal for God. Without large and deep doses of God’s Word, I am very vulnerable to worldy mindsets. One church in Korea expets its members to read five chapters of the Bible a day and its pastors to read twenty chapters a day. The question is: If you want the flame of the Emmaus road and the flame of Brainerd, are you willing to make serious experiments?
John Piper, Taste and See: Savoring the Supremacy of God in All of Life, p. 221