John Calvin begins this classic treatise on prayer by giving us a definition of prayer, emphasizing its necessity and use. He addresses the objections that some people have when it comes to prayer, such as, that prayer seems useless, because God already knows our wants. He then outlines four rules to be observed in prayer: reverence to God, a sense of our want, the suppression of all pride, and a sure confidence of being heard. He gives a good overview of different kinds of prayers: vows, supplications, petitions, thanksgivings. After he gives some guidance for the use of prayer in public worship, he gives a wonderful exposition of the Lord's Prayer. While certain of Calvin's arguments are addressing issues faced at the time of the Reformation, the modern reader will discover timeless truths, solidly based on God's Word, detailing the necessity and benefits of persevering in prayer (citation from ministryformation.com.au).