Romans 8:28

And we know that all things work together for good to them that love God, to them who are the called according to his purpose. – Romans 8:28

When Job lost all his wealth, when he lost his sons, everything seemed to militate against him, but since he loved the Lord, the evils that befell him worked together for his good. The vermin of his body were preparing for him the crown of heaven. Before the time he is tempted, God has never spoken to him; after he is tempted, however, God comes to him and speaks familiarly with him, as a friend with his friend. Let calamity strike, let every kind of disaster fall, as long as after the catastrophe Christ comes.

– Jerome

When Paul speaks of “all things” he mentions even the things that seem painful. For if tribulation, or poverty, or imprisonment, or famines, or deaths or anything else should come upon us, God can change them into the opposite. For this is one instance of his ineffable power, that he can make painful things appear light to us and turn them into things which can be helpful. Paul talks about being called “according to his purpose” in order to show that the calling itself is not enough…. The calling was not forced on anyone, nor was it compulsory. Everyone was called, but not everyone obeyed the call.

– John Chrysostom