Why does Malvolio want to believe that "All is Fortune"? Malvolio knows that everything is determined by fate, so he's going to
stop trying to make anything happen. He is frustrated by his lack of progress with Olivia and wants to call on Fortune for help. He wants to believe that he can change his circumstances by being in the right place at the right time. He knows that he will never win Olivia's love and wants to believe that it's Fortune's fault.