This article re-thinks the development of Paul’s thought between 1 and 2 Corinthians. Instead of the traditional developmental interpretation of Paul that emphasizes the differences between 1 Cor 15:35–57 and 2 Cor 5:1–5, I argue that a discernable development is to be found between 1 Cor 12:13 and 2 Cor 4:7–12. I demonstrate significant parallels between the two latter texts in terms of topic, argumentation, and the conceptual structure on which Paul’s argumentation is built. Based on the parallels, I argue that 1 Cor 12:13 conceptually allows for the innovative idea of “ongoing transformation,” which is formulated in 2 Cor 3:18, and provides the conceptual structure of “double body-containers” in 2 Cor 4:7–12 to expound this new idea. In the context of 2 Corinthians, responding to opponents’ challenge against the apostle’s physical weakness in sufferings, Paul goes on to develop the idea of ongoing transformation further by transforming mortality. Mortality becomes a form of human participation in God’s cosmic war and is considered constructive to the ongoing transformation of the inner person and the complete transformation in the future.