Rochester ended up married to Bertha because social convention is that people do not share inheritances, and so his father needed to find him a rich wife. Out of love and gratitude to the Rivers, Jane breaks that social rule. As for the Rivers, Jane’s generosity rewards their true Christian charity, which was given without any expectation of compensation. In sharing her inheritance, Jane also atones for the injustices of her uncle, who was responsible for the Rivers’ loss of wealth.