The thesis of this book is that virtue ethics is key to understanding Trinitarian progressive sanctification. The thesis is supported by four reasons why virtue ethics is key to understanding Trinitarian progressive sanctification: (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. The active roles of Jesus in sanctification, ordered by the Triune premise, indicate that the Trinity sanctifies such that: (1) the value having its source from the Father, is revealed through the teaching of the Son to motivate believers, who are empowered to be motivated by the Spirit, (2) the character that is from the Father is revealed through the Son’s example that is to be imitated by the believer through habituation and reciprocity, by the Spirit’s leading, and (3) believers are led by the Spirit’s intercession into prayer (Rom 8:14-16, 26-27), to be helped through the Son’s priestly intercession, in order to receive an answer from the Father, with the aim of manifesting the virtues of endurance and hope in the lives of believers.