Jesus' response to their question is to the point, "You are deceived, Don't you know the Scriptures or the power of God?" It is also paradigmatic. The life of the Christian is to know the Scriptures AND to know the power of God from experience. The Scriptures and experience with God form two safeguards against practical and doctrinal error.
How would Jesus' answer have been different if the lawyer had been earnestly wanting to know the most important things instead of simply trying to trick Jesus?