There is a widespread misunderstanding among the heterodox, in which suffering is considered to be some sort of antidote or counterweight to sin. One suffers in order to make up for ones past sins or those of others. "Voluntary expiatory suffering", by Christ and/or by us in union with Him, is thought somehow to be pleasing to God, as if it were the opposite of sin, helping to even up the celestial ledger.
This notion is illustrated in something a Roman Catholic saint wrote, quoted in this entry in a Catholic blog entitled, "Joining God in penance and suffering".
When someone desires to suffer, it is not merely a pious reminder of the suffering of the Lord. Voluntary expiatory suffering is what truly and really unites one to the Lord intimately. When it arises, it comes from an already existing relationship with Christ. For, by nature, a person flees from suffering. And the mania for suffering caused by a perverse lust for pain differs completely from the desire to suffer in expiation. Such lust is not a spiritual striving, but a sensory longing, no better than other sensory desires, in fact worse, because it is contrary to nature. Only someone whose spiritual eyes have been opened to the supernatural correlations of worldly events can desire suffering in expiation…
Only those who are saved, only children of grace, can in fact be bearers of Christ’s cross. Only in union with the divine Head does human suffering take on expiatory power.
It's actually a slur upon God's kindness, compassion, and love, to think He is pleased to see us suffer. He is pleased to see us love and obey, even if that brings suffering, but the suffering itself is not the point. The love is, together with the obedience love brings. Obedient love, not suffering, is the real opposite of sin.
Good News: God's forgiveness - freely offered, not in return for for anything else, especially suffering! - is what truly expiates (undoes) our guilt. And it's Christ's Resurrection that expiates our death.
Trampling down death by death
And upon those in the tombs bestowing Life!