The Sixth Petition of the Lord’s Prayer is, in the minds of many people, the most challenging of the seven petitions to understand.

With all the press that comes with being a pastor, it can be hard to focus on your ultimate calling: proclaiming the Word of God. That’s why Martin Luther’s “Sacristy Prayer” has been encouraging your brothers in the ministry for generations—both as you prepare to write sermons and as you stand to deliver those sermons.

A prolific writer, professor, and pastor, Johann Gerhard (1582–1637) is regarded as one of the greatest theologians and thinkers of his time. Meditations on Divine Mercy is a collection of prayers written by Johann Gerhard. In addition to Gerhard’s prayers, the book also includes a chapter on the purpose and benefits of prayer, as well as an explanation of the blessing and historic aspects of daily meditation.