1 and 2 Corinthians.
When Paul wrote his 2 letters to the Corinthians, was he correcting (rebooting!) the ways that things were done, or the ways that people thought? We can’t really separate out the two and still read a fully coherent letter.
In 1 Corinthians Paul is mostly interested in problem solving to make sure that everyone and everything works together well, especially in areas where he perceives the church to be lagging behind. Then in 2 Corinthians, there is a strong emphasis on everyone in the church being humble enough to acknowledge their weaknesses, and so therefore their need for each other, so that they can learn and grow together as one.
What do we need to learn about growing together as a priority?