Verse 3
We glory in spirit in the afflictions, oppression, and persecution, which we suffer as Christians, esteeming them a great blessing. Thus the apostles went rejoicing from before the council, because they had been thought worthy to suffer disgrace for the name of Jesus. (Acts v.) And St. James (chap. i.) says: Think it the greatest joy when you fall into various temptations: (i.e. tribulations) for these sufferings greatly serve to confirm the elect in the hopes which they have of enjoying the glory of the world to come. (Estius)
Verse 5
Having preented us with his gifts when we did not at all deserve them, having showered upon us the blessings of faith, charity, patience, and fidelity, we cannot but have the greatest confidence that after this pledge and assurance of his good will towards us, he well finish the work he has begun, and bring us to his heavenly kingdom. (Calmet) — Not only the gift of the Holy Spirit, but the Spirit himself, is given to us, who resides in our soul as in his own temple, who sanctifies it, and makes if partaker of his divine love. (Menochius)