The Book of Psalms

Though all Scripture is fragrant with God’s grace, the Book of Psalms has a special attractiveness.

In the Book of Psalms there is profit for all, with healing power for our salvation.  There is instruction from history, teaching from the law, prediction from prophecy, chastisement from denunciation, persuasion from moral preaching.  All who read it may find the cure for their own individual failings.  All with eyes to see can discover in it a complete gymnasium for the soul, a stadium for all the virtues, equipped for every kind of exercise; it is for each to choose the kind each judges best to help gain the prize.

— from Commentary on the Psalms by Ambrose of Milan (397)