The moral of this story is that no matter how difficult the journey is, as long as you keep working hard, the end result will be positive and fulfilling. It encourages people not to be deterred by obstacles but to keep striving towards their goals.
I haven't come across the story 'pyar ka dard hai meetha meetha' before. It could be a story that is only known within a certain community or among those who are fans of a particular genre or author. To fully understand it, we would need more details about its origin, the characters involved, and the main plot.
Without more knowledge about the 'kitne chaurahe' full story, it's hard to define the main plot. It could be a story set in a town with a number of crossroads and the events that unfold around them, like the people who meet at the crossroads, the secrets that are shared or the decisions that are made there. But again, this is all guesswork until we know more about this particular story.
There could be various English stories that might be related to the concept of 'Sabar ka phal meetha hota hai'. One such story could be about a gardener. The gardener plants a seed and waits patiently for it to grow. He waters it regularly, protects it from pests, and waits through different seasons. Eventually, the plant grows into a beautiful flower or bears delicious fruits. This shows how his patience was rewarded with something wonderful, just like the saying implies.
Without having read the novel, it's hard to determine the exact main theme. But given the title which contains the word'mohabbat' which means love in Urdu, it might be centered around love. It could also potentially be about new beginnings or hope, as'subh' means morning and a star in the morning can symbolize new hope or a new start in a love story.
I'm sorry I don't know the exact theme as I'm not familiar with this novel. It could potentially be about love and longing given the words 'hasraton' which might be related to desires.