In Reformed theology, baptism is a sacrament signifying the baptized person's union with Christ, or becoming part of Christ and being treated as if they had done everything Christ had. Sacraments, along with preaching of God's word, are means of grace through which God offers Christ to his elect. Sacraments are believed to have their effect through the Holy Spirit, but these effects are only believed to accrue to those who have been predestined to have faith in Christ.