The library of Nag Hammadi constitutes, together with the manuscripts of Qumran, the most important discovery of ancient texts of the modern Era. Most of the writings that comprise this library are Gnostics. Today we know that gnosis and gnosticism form the nucleus of a movement of ideas that dominated the religious and philosophical thought of the Mediterranean basin between the I and IV centuries of our era. The library of Nag Hammadi sheds a decisive light for our knowledge not only of Gnosticism, but of the whole scope of philosophical and religious speculation (Jewish, Christian and pagan) in the Greek language of the 1st to 4th centuries, and of the scope of the Egyptian culture, Coptic, of the fourth century, in which there were varied interests, not only Gnostics, but also hermetic, Christian and Manichean. This work presents the first complete version of these manuscripts on the original texts, following the best critical editions of the Coptic text. In addition to the general introduction to the gnosis with which the first volume starts, in the three volumes that make up the series each text is accompanied by a brief introduction and informative notes that clarify their understanding difficulties. This third volume gathers diverse apocalypse and other writings on topics of the New Testament or on the Old Testament in its projection towards Christianity. The indexes with which this volume is completed, particularly the analytical material, help the reader in his understanding and arrangement of the Gnostic thought of Nag Hammadi.