“What is better? To be born good or to overcome your evil nature through great effort?”
The more I hear/read that line, the more I loathe what it represents. Being good is not a competition; the world is better with both people that are kind without a second thought and people who are perpetually on the path of self-improvement. Indeed, one can learn from the other: the innately good being can be thankful that they never had to struggle and the evil being struggling to rise in morality sees the unfailingly altruistic/benevolent individual as a source of inspiration.
By the way, this outlook doesn't preclude the possibility of evil beings (i.e., monsters) that cannot change.