Even the early Church had problems with Church division, and here Paul was pleading with them to unite rather than split into factions.  For if you think about it, if the  local Church can’t come together and become one voice…how do we expect the world to follow suit?  When Jesus called those first disciples, He told them to “Follow Me, and I will make you fishers of men.” (Mark 1:17)  And if you look at the other meaning for the Greek word for “perfectly united”…  it means to mend or repair broken nets.  Now anyone knows you can’t catch fish with torn nets…so how can the Church expect to follow Jesus and be fishers of men when their nets are shredded with division and strife?   We as a body of Believers need to become perfectly united together, and mend our nets.