In both the Old and New Testaments, God calls his people to become more like him. At Mount Sinai, the Israelites received the charge: "You shall be holy; for I the Lord your God am holy" (Leviticus 19:2). During the Sermon on the Mount, Jesus reiterated this command: "You, therefore, must be perfect, as your heavenly Father is perfect" (Matthew 5:48). In his Letter to the Philippians, Paul paints a vivid picture of how to pursue this goal. We are not called to strive after holiness in some abstract way, but to do so by imitating Christ—specifically in his sacrificial gift of self. It is a call to pour ourselves out as an offering to God, just as Jesus did on the Cross. Embracing this "loss of all things," Paul tells us, is the only way to "gain Christ and be found in him" (Philippians 3:8-9).