Wherefore I desire that ye faint not at my tribulations for you, which is your glory.
Wherefore - since our spiritual privileges are such (Ephesians 3:12), 'I entreat you not to be dispirited' х engkakein (G1457a)]: so intimate was their Christian union with him that they were in danger of losing heart at his afflictions, as though their own. For you - in your behalf.
Which is your glory - since God loved you so much as both to give His Son for you and to permit His apostles to suffer 'tribulations' (Chrysostom) in preaching the Gospel to you Gentiles (note, Ephesians 3:1). My tribulations are your "glory," as your faith is furthered thereby (1 Corinthians 4:10).