In the words of Augustus Strong...
“Christianity is summed up in the two facts: Christ for us,
and Christ in us—Christ for us upon the
Cross, revealing the eternal opposition of holiness to sin, and yet, through
God’s eternal suffering for sin making objective atonement for us; and
Christ in us by his spirit, renewing in us the lost image of
God, and abiding in us as the all-sufficient source of purity and power. Here
are the two foci of the Christian ellipse: Christ for us, who
redeemed us from the curse of the law by being made a curse for us, and
Christ in us, the hope of glory, whom the apostle calls the
mystery of the gospel."
“The
union with Christ is mediated by his Spirit, whence we are both renewed and
justified. The great fact of objective Christianity is incarnation in order to
atonement; the great fact of subjective Christianity is union with Christ,
whereby we receive the atonement. We may add that this union with Christ, in
view of which God elects and to which God calls the sinner, is begun in
regeneration, completed in conversion, declared in Justification, and proved in
sanctification and perseverance."
