On the other hand, Jabez' prayer for God to bless him is just that. But through the miracle of book deals and modern marketing it is now the way, the truth, and the life for many people. That's unfortunate. God could have chosen to answer Jabez no matter what he prayed, even if he was misguided in his prayer. And he may have been misguided, or else specifically guided by his spirit for that time in his personal life. And God can answer the many sincere but misguided "Jabez prayers" today as well, even if they aren't what God would want for a person at the time.
That's why it's best to be guided by the spirit in every situation we face. In prayer, follow the outline of commands to Christians in the New Testament and go from there. But Jabez' prayer was never before and shouldn't now be elevated to the pattern given to the Church by Jesus or a Pauline Epistle, just because Bruce Wilkinson wants to rake in the cash with a new fad.