The book of Psalms is your regular go-to book in any situation and mood you find yourself. It seems to have the right text and context fit for every life situation in the Christian walk. Beyond this, it may interest you to know that this book is an expression of a personal and communal worship life in what seems to be shrouded in poetry, yet at its core, is a revelation of Christ in prophecies on His nature, coming, work, death, resurrection and everlasting Kingship.