This is a "Wow!" kind of book, simultaneously accessible and profound. Bernard Bangley did a masterful job of condensing the hefty original work down to 140 coherent and surprisingly practical pages.
Francis de Sales (1567-1622) had a reputation for holiness and for great preaching when he was Bishop of Geneva. Reading this book, it is easy to see why. Fortunately, this treatise is more than a relic from Christian history; it's a gift that keeps on giving, like its subject.
My copy of the book now has perhaps 20 checkmarks in the margins of its pages, because Francis is forever writing things like "Any 'inspiration' that tempts us to quit doing something worthwhile in order to be available for some vague future activity is highly suspect," and "What difference does it make whether God's will is demonstrated to me in suffering or in comfort? The only thing I want is to know God's will. Perhaps it can be seen more clearly when no other beauty is present."
Francis shows from Revelation 3:20 and Song of Songs 2:10 that God makes house calls. The bishop was fond of bees, and a dab hand with arboreal metaphors, too. Part of his sage advice to readers is to "Notch your heart with holy penitence, put the love of God in the cleft, and then graft onto it any virtue you wish."
More examples would only muddy the point, so let me close by saying that this treatise is great stuff, all of it, firmly rooted in the life of Jesus Christ. Saint Francis de Sales himself feels to me like a new friend in heaven, and if that's not recommendation enough to read his writing, I don't know what would be.