It refers to the coming of Christ for His church, and the events associated with it. This is called the Rapture. The Rapture can occur at any time. Sanctification is the process whereby we become more saintly in practice, only by God's help. The defending of the faith answers questions of the critics.
Confirmation establishes the faith more firmly in the hearts of believers.
If you would like to see and download the complete Study Guide for Phillipians, click here on Talks for Growing Christians .