Most approaches to correct prayerlessness are “law based.” When you hear a sermon that says,“You only pray 6 min a week; ergo you stink,” you resolve to go pray more. But how long does that last? A few days, at most. Sometimes not even to the parking lot.The answer is not to get more disciplined or to develop a new system or a prayer notebook. Prayer is the natural result of desperation and faith. When the Gospel has cultivated humility and faith in us, we will obey that verse in 1 Thessalonians, “Pray continuously,” instinctively."
JD Greear, Why we don't pray part 1 (read the full thing here)