Splitting body, blood, word

In his theological treatise on the Lord’s Supper, Calvin spits blood against splitting the sacrament of the body and blood of our Lord by giving communion only in one kind.

It is possible to imagine analogous errors concerning the Word of God. For example, it would be wrong to divide the earlier Covenant from the renewed Covenant. It would be wrong to set one scripture against another. It would be wrong to preach only on certain texts or on certain doctrines and not give the people the whole word of God. This would be to deprive the people of their rights just as much as to only give them the bread and not the cup.