The thesis of this book is that virtue ethics is key to understanding Trinitarian progressive sanctification. The thesis is supported by four reasons: (1) the Trinity, virtue ethics, and sanctification are historically and conceptually interconnected in the tradition and Scripture; (2) virtue ethics based on metaphysical realism is the most biblically consistent ethical framework for Trinitarian progressive sanctification; (3) Jesus' active roles as a teacher and example of virtue play an important part in Trinitarian sanctification; and (4) Jesus' priestly heavenly intercession aimed at manifesting virtue in believers is crucial to understanding how the Trinity progressively sanctifies believers.