what is jerusalem worth nothing everything

In the movie Kingdom of Heaven, after Balin surrenders control of Jerusalem to Saladin, he asks the question, "What is Jerusalem worth?" Saladins response is "Nothing" and then he turns around and walks towards his camp, but then he turns back around to face Balian and says "Everything" with a smile on his face, and then returns to his camp. The meaning behind Saladins response has been interpreted in different ways. Some people believe that Saladin meant that Jerusalem is worth nothing in terms of materialistic value, but it is worth everything in terms of its spiritual and cultural significance. Others believe that Saladin meant that Jerusalem is worth nothing if it is not shared and respected by all people, but it is worth everything if it is a place of peace and unity.