"Because actually it's really hard to get things made. It takes years. To fight the fights you inevitably have to fight, even when you've produced Harry Potter, you'd better have the commitment and the passion to knock down walls, not take no for an answer"

This quote by David Heyman talks to the trouble of getting things made. It is challenging to bring a project to fulfillment, and it often takes years of effort and dedication. Even when one has achieved success, such as with the Harry Potter franchise, it is still essential to have the dedication and enthusiasm to push through the obstacles that will inevitably develop. This implies not accepting "no" for an answer and wanting to eliminate the fights that include the procedure. It is clear that Heyman believes that the only way to get things done is to have the determination and drive to keep going, no matter what.