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This chapter shows that the primary source for Isaac’s eschatology is John the Solitary’s depiction of the life of the future world. According to John, transformation in the future world represents the fulfillment of God’s promise of future glory and forms the basis of the hope that should define the life of the monk. Isaac’s selection and use of the same Pauline biblical phrases used by John, such as “hope to come,” “way of the new life,” and “inner man,” together with John’s non-biblical serpent analogy reveals Isaac’s dependence on John’s eschatological formulations. The main difference between John and Isaac is that while John encouraged monks to obtain knowledge of the future world in order to provide them with hope amidst their current struggles, Isaac explicitly states that perfect Christians can experience the transformation of the future world while still in this world.

This chapter shows that Isaac derives his conceptual framework for the concept of ecstasy, along with the technical terms wonder and astonishment, from sources that were originally written in Syriac. In particular, both Ephrem and John the Solitary situate wonder and astonishment within the framework of the future world, which means that Isaac’s desire to frame wonder and astonishment in terms of the mind’s ability to wander into heaven and acquire knowledge of the future world demonstrates his dependence on a trajectory of thought that arises from these two authors. Isaac, however, offers the distinct contribution of describing this connection between wonder and knowledge of the future world with the language of itinerancy. According to Isaac, perfect Christians obtain heavenly knowledge during the moment of prayer, when their minds become itinerant and wander into heaven in order to receive a pledge of the heavenly mysteries from the Holy Spirit.

This chapter demonstrates that Isaac’s moral psychology is both an explanation of how the heavenly mysteries affect the soul and a description of how the soul helps prepare the mind for the reception of the heavenly mysteries through wonder. In formulating his moral psychology, Isaac takes bits and pieces from a number of currents already within his own tradition: he uses John the Solitary’s “three degrees” as an explanation for moral failing in the soul; he uses Evagrius’s tripartite (i.e., Platonic) theory of the soul in order to describe the constitution of the soul; and finally, he uses language borrowed from the Syriac translations of the Pseudo-Dionysian and Pseudo-Macarian corpi in order to explain how loving desire (eros) aids the soul in contemplation. Finally, Isaac’s unique contribution is his account of the soul’s impulses, which work to counteract the negative effects of the bodily senses.

This chapter examines Isaac’s synthetic account of wonder and astonishment, which makes use of all the source material discussed in the previous three chapters. According to Isaac, the human soul is capable of processing material sensations with temporal reasoning, but it cannot process spiritual forms of knowledge. Since spiritual insights are immaterial and cannot be understood through temporal reasoning, the soul enters into a state of uncomprehending astonishment when it receives spiritual insights from divine revelation. The mind, by contrast, is capable of comprehending spiritual insights through wonder. The transition from astonishment to wonder represents the moment when a person moves from soul to mind and begins to comprehend the mysteries of the future world through ecstasy. Once people understand the mysteries of the future world, they begin to live the heavenly way of life while remaining in the material world.