I have a secret weapon that I have been using for almost twenty years now. I pull it out anytime I am preaching from the biggest book in the Bible. My weapon is John Calvin’s commentary on the Psalms.
We read and discussed the 13 page introduction to this work last week in pastor’s meeting.
Here is sampling –
I have been accustomed to call this book, I think not inappropriately, “An Anatomy of all the Parts of the Soul;” for there is not an emotion of which any one can be conscious that is not here represented as in a mirror. Or rather, the Holy Spirit has here drawn to the life all the griefs, sorrows, fears, doubts, hopes, cares, perplexities, in short, all the distracting emotions with which the minds of men are wont to be agitated.
The other parts of Scripture contain the commandments which God enjoined his servants to announce to us. But here the prophets themselves, seeing they are exhibited to us as speaking to God, and laying open all their inmost thoughts and affections, call, or rather draw, each of us to the examination of himself in particulars in order that none of the many infirmities to which we are subject, and of the many vices with which we abound, may remain concealed. It is certainly a rare and singular advantage, when all lurking places are discovered, and the heart is brought into the light, purged from that most baneful infection, hypocrisy.
In short, as calling upon God is one of the principal means of securing our safety, and as a better and more unerring rule for guiding us in this exercise cannot be found elsewhere than in The Psalms, it follows, that in proportion to the proficiency which a man shall have attained in understanding them, will be his knowledge of the most important part of celestial doctrine.
Genuine and earnest prayer proceeds first from a sense of our need, and next, from faith in the promises of God. It is by perusing these inspired compositions, that men will be most effectually awakened to a sense of their maladies, and, at the same time, instructed in seeking remedies for their cure.
In a word, whatever may serve to encourage us when we are about to pray to God, is taught us in this book.
You can access the whole thing at the Christian Classics Ethereal Library.