Back in verse 27, Paul encouraged the Philippians to conduct themselves in a worthy manner. In these final two verses of chapter one, the reason for that becomes very clear.
You can see it for yourself in Philippians 1:29-30:
The Philippian believers needed to conduct themselves in a manner worthy of the gospel of Jesus Christ. But why? Paul explains why here. It is because they will experience the same struggles that Paul is facing.
Let’s look at these verses phrase by phrase.
For it has been granted to you – It is no accident that the Philippian believers will experience persecution and suffering. God has ordained it. The word “granted” is rooted in the same word as grace. Paul is making a bold statement here: the Philippian believers have been graced with the opportunity to believe, and to suffer because of it. That indicates that suffering is not something to be avoided at all costs. As uncomfortable as it may be, it serves a very important purpose in the life of the believer, both in Philippi and today.
On behalf of Christ – This identifies the Philippian believers with Jesus, as it does for us. We are not only called to suffer with him, but for him.