08/20/2026
Reflection: Bad Yeast and Good Yeast
By John Tillman
Paul repeats this line, “A little yeast works through the whole batch of dough,” in 1 Corinthians. (1 Cor 5.6-7) In Corinthians, Paul was concerned that a case of sexual immorality would spread and damage the reputation of the church. Here, Paul was concerned that the Galatians were being misled to follow strict Jewish laws.
So which is it, Paul? Does “yeast” lead to breaking God’s law or to following God’s law? If one law from scripture is binding, Paul, why do you say people don’t have to follow them all?
In the majority of scripture yeast is treated like a corrupting agent. Nearly every mention is about keeping yeast out of spaces, places, and food that is holy…
Paul and Jesus were concerned about the yeast of false teaching and sin. They wanted it exposed and thrown out…In Luke, Jesus specified yeast as the sin of hypocrisy and stressed that hidden things would be exposed. However, Jesus also compared the Kingdom of God to yeast spreading through a large batch of dough.
So, there is good yeast, which is the gospel the Galatians risked losing. And there is bad yeast, including pride, self-righteousness, hypocrisy, sexual immorality, and other sins.
We need to seek out and throw out bad yeast…Sinful yeast makes us unclean and infects everything we touch.
We need gospel yeast. This yeast works through our whole lives, changing the flavor of our faith and filling us with pockets of God’s Spirit.
Share the gospel. It is good yeast.
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https://theparkforum.org/843-acres/bad-yeast-and-good-yeast-2