THE LORD'S PRAYER: Our Lord has given us the 'Our Father' as a model prayer, and has expressly commanded us to use it. It is the most excellent and comprehensive of prayers: and in it we pray for all that is best, and from deliverance from evil. But, let it be remarked, the good things we ask are spiritual, and the deliverance we pray for is from spiritual evils. We pray for both a temporal and a spiritual benefit only in the fourth petition, when we ask for the daily necessaries of life. This ought to teach us to pray chiefly for spiritual blessings, such as grace, pardon, virtue, etc.; and not only for such temporal benefits as health, a good harvest, etc.
[From 'A Practical Commentary on Holy Scripture' by Bishop Knecht, D.D.]