Chapter 27, Of the Sacraments:
How is your theology of the sacraments? Is it adequate? Is it a faithful summary of the full spectrum of biblical theology?
Simply put, as holy signs and seals of the covenant of grace, the sacraments bid us to behold what God has done for us, for our salvation, in his Son–freely given to us, to be received by faith alone–and not based on our obedience and good works.
I commend the above summary from the 17th century Westminster Confession of Faith, a confession which continues to serve as a standard for many Reformed and Presbyterian churches.