There is the eternal salvation direct from our confession and repentance acknowledging Jesus Christ as Lord, the salvation that because of His sacrifice was purchased and imputed to us. There is also the salvation having the knowledge of Jesus Christ that we are fruitful with as applied toward our daily circumstances and situations; this is the type of salvation that we work out. One can be saved in the one sense but yet be a poor worker of the salvation that effects daily life, even by the things in this same chapter Paul speaks to, contention and strife and isolation from the broader body etc..
Paul has returned Epaphroditus to the brethren in Philippi to cheer this congregation up. Paul is also about to send Timothy his prize student to strengthen them. In his letters Paul seems to make everything even general matters as a teaching opportunity. We also see that Paul could only trust certain people for certain types of missions. Paul not only thought of who needed help but who it was that he was sending.
2012 - pBiblx2 Field Wise Bible System Version 2.0.9d - GPL3