For it has been granted to you that for the sake of Christ you should not only believe in him but also suffer for his sake, Philippians 1:29
Even if I am to be poured out as a drink offering upon the sacrificial offering of your faith, I am glad and rejoice with you all. Philippians 2:17
that I may know him and the power of his resurrection, and may share his sufferings, becoming like him in his death, Philippians 3:10
Yet it was kind of you to share my trouble. Philippians 4:14
The point being that Paul was showing the joy we can have in suffering. This became clear to me through the experiences of many saints, that talked about the overwhelming comfort of the presence of the Spirit of Christ in the mist of their sufferings. So Philippians give us how we experience God's peace, comfort, fellowship in sufferings when we die to and humble ourselves.