Two Natures, and the Mystical Exchange.

"Just as divine and human things are predicated about Christ because of the personal union of the two natures in Christ, so also through the spiritual union of God and the faithful soul, and Christ and the Church, become one mystical thing, 'one spirit' (1 Cor. 6:17), about which both human and divine things are predicated... Through this mystical exchange, Christ transfers our sins to Himself and grants His righteousness to us through faith. This is not a bare and verbal predication, but a most effective and, so to speak, most real imputation." Johann Gerhard