Not until we fully understand our human condition—that of total depravity—can we fully appreciate what God did for us through Christ's death and resurrection.
After denying Christ three times, Peter had certainly failed. But Jesus restores Peter in a post-resurrection appearance, asking Peter three times if he loves Christ.
When Paul was converted to Christ, he quickly learned that suffering was part of the deal—and he embraced it, all for the cause of the gospel. So should we.