I’m not sure whether Marya’s advice to forgive is a different position from Seneca’s, who still recommends us to place the wrongdoer on “the right path”. When the damage has already been done, it seems like both of them would agree that making judgements and seeking revenge will be wrong. It’s not anger that’s called for but helpful instructions for leading a better life.
These kind of moral arguments also have implications for the theory of history of course. If Marya is right and everything that happens is just an expression of God’s will — then no particular human beings will have any greater or less significance.