The thought and poetry of Mario Luzi (Florence 1914-2005) reveals a profound influence of the theological legacies of St. Augustine and Teilhard de Chardin. The former's influence is embodied in the focus on the homo interior and a confessional dimension, while the latter's legacy is reflected in a vision of the world as a perpetually evolving reality, marked by a continual state of 'principianza'. This paper, concentrating on Luzi's works coinciding with the Conciliar and post-Conciliar period, specifically from Nel magma (1963) to the posthumous Lasciami, non trattenermi (2009) - aims to shed light on the productive tension between divine immanence and transcendence, as well as between dynamism and stasis, engendered by the theological heritage of Teilhard and Augustine, personally reevaluated in light of the new calls for renewal and problematization advocated by the Second Vatican Council. It further examines how this legacy manifests both explicitly, through the citation of key theological texts in the paratexts, and implicitly, through rhetorical and expressive strategies and the recurrent use of distinctive lexical motifs.