Paul admonishes the Philippian church to keep a watchful eye out for those seeking to destroy. Paul describes three such people in this passage...
Worship, Circumcision, Evildoers, Church General, Dog
To expose evil doers as haters of LIGHT (JESUS) and to show that they need to hide in darkness so their deeds will not be exposed.
Persecution, Hate, Hatred, Evildoers, Opposition To Christ