Paul insists in verse 5 that “each one should be fully convinced in his own mind” concerning observing sacred days, and in verse 23 he warns that “whoever has doubts is condemned if he eats, because the eating is not from faith. For whatever does not proceed from faith is sin.” In other words, one must be careful not to impose upon his own conscience or another person’s conscience a religious practice of which he is not fully convinced based on biblical prescription.
One important principle articulated in several places in the New Testament was an emphasis upon the importance of biblical authority for worship practices. Usually these kinds of discussions came in the context of confronting the legalism of the Jewish religion. During his ministry, Jesus had already condemned the adding of religious practices not prescribed in the Scriptures; the same problems continued with the “Judaizers,” Christian converts who taught that it was necessary to adopt Jewish religious practices from the Law of Moses. The church first encountered this when some Jewish Christian converts traveled to Antioch and insisted to the Christians there, “Unless you are circumcised according to the custom of Moses, you cannot be saved” (Acts 15:1). This resulted in the formation of a council of church leadership in Jerusalem, including James, Peter, and Paul, to debate the matter. The council concluded that requiring such religious practices not prescribed for the church was “a yoke on the neck of the disciples” (v. 10).