"You cannot destroy God's good purposes for us."

Commenting on Joseph's & his brothers' experiences, Tim Keller writes:

We must never assume that we know enough to mistrust God's ways or be bitter against what he has allowed. We must never think we have really ruined our lives, or have ruined God's good purposes for us. The brothers must surely have felt, at one point, that they had permanently ruined their standing with God and their father's life and their family. But God worked through it. This is no inducement to sin. The pain and misery that resulted in their lives from this action were very great. Yet God used it redemptively. You cannot destroy his good purpose for us. He is too great, and will weave even great sins into a fabric that makes us into something useful and valuable.

(Walking with God through pain and suffering, p.264)