Why did Mary Baker Eddy reject the predestination teachings associated with her father’s Calvinism?

Mary Baker Eddy rejected the predestinarian Calvinism of her father’s "relentless theology" because she struggled to reconcile the existence of a world filled with misery and pain with the belief in a loving God.1

While many of her contemporaries who abandoned Calvinism turned toward a belief in a benign God, Eddy sought a deeper understanding of how a God of love could coexist with human suffering. She eventually concluded that the traditional view—which attributed the creation of matter to God—was a fallacy. She argued that this belief incorrectly made God responsible for all suffering in the universe. Instead, she came to believe that the material world is a false sense of reality resulting from human perception, and that true existence is found in Spirit.123