This is a very comprehensive treatise on Prayer by a Doctor of the Church, St Alphonsus Liguori and is a must read for all Catholics. There are so many elements of prayer that are misunderstood or simply overlooked that are essential to our Catholic Faith and especially for Salvation.I have already published several spiritual works, but of all these works, I do not consider one more useful than this little book which treats of prayer as a secure and necessary means of obtaining salvation and all the graces necessary for it. Were it in my power, I would publish as many copies of this little work, as there are Christians on earth, and would give to each a copy, that each might be convinced of the absolute necessity of prayer for salvation. -St Alphonsus Liguori