Abstract

In 1917 Pierre Teilhard de Chardin wrote an essay that proposes union as a way to observe how the process of evolution takes place. He spent the remainder of his life broadening and sharpening the vision, which was based on union in nature. We propose that this vision and the historical development of thermodynamics and classical statistical mechanics offer insight into union and even into the divine life that many Christians believe to be triadic. We briefly situate union in the triune divine life in early Christian tradition as it was believed and practiced. We then interpret three stages of development in the sciences of thermodynamics and statistical mechanics that support the theme of union in nature. Next we describe the development of Teilhard's thought during his scientific career and his tests of the theme of union, principally in his private journals, now being edited. We offer examples of Teilhard's application of union to his own spiritual life and compare his understanding of union with those of Paul the Apostle and John of the Cross. Finally, although the Christian God's triadic life was not a particular concern of Teilhard, we propose union in nature as a vestige of the divine life.