The objective of this study is to answer the question "What is the cause of salvation?" according to Paul. The argument is that just as Philo understood cause in an Aristotelian sense of the multiplicity of causes (formal, material, efficient and final) as constituting one overarching cause—what is here called the "means" of salvation—so, too, Paul implicitly assumes that the one cause or "means" of salvation consists in various causes. A second step shows how the "means" of salvation corresponds to faith as the "mode" of salvation. In nuce, the "means" of salvation is the initiative of God and the "mode" of salvation is the human response to that divine initiative.