As Paul begins to wrap up his letter, he offers some practical application regarding everything he's been teaching for three entire chapters. And it all centers on two prominent women having a high profile disagreement. Paul is willing to "name names", as in the McCarthy Communist hunts of the 40's and 50's, but Paul's purposes are much more sacred and uplifting... because they are carried out "in the Lord".
Communism; feminism; heavy criticism of the King James Version; plus two mega-themes in Philippians: this sermon's got it all.