Discover a complete gymnasium for the soul

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 teaching. 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 of the virtues, equipped for every kind of exercise; it is for each to choose the kind he judges but to help him gain the prize.

Saint Ambrose, Explanations of the Psalms

It is as if the book of Psalms is a condensation of the scripture in the elements that Ambrose describes above.