 Fervour for dharma is actually a fervour longing, a yearning for the right way to live for yourself. There's no one right way for everyone. That is why you say Hindu dharma because it isn't a religion, it's a huge body of different ways and means of living according to each one's choice. So your fervour for dharma is actually your fervour for the right way to live for yourself. In other words, a way of living which keeps the suffering low and raises the joyousness of your existence.