Throughout the 20th century, a multitude of inspirations of various kinds transformed the content and importance of this treatise on the beyond and "the last things". It went from being more or less marginal to being inserted at the heart of theology. 

In the last two centuries, biblical exegesis has produced, with fantastic erudition, an enormous volume of material, although also quite scattered and not always coherent. For this reason, it is worth remembering that Jesus Christ himself made an explicit exegesis, which is the key to all believing exegesis.