Sanctification

Certainly the Spirit dwells in us, but he does so to maintain our faith-union with Christ. This union, which is signified by baptism, is described as effecting something quite amazing. It means that what took place in Christ in his life, death and resurrection, God now regards as having involved us. The merits and perfection of Christ are applied to us so that what belongs to him as the true Son of God, belongs to us who are caught up "in him".

Graeme Goldsworthy, According to Plan, Pg. 220