What is the nature of dialogue between different spiritual leaders?

According to Osho, genuine dialogue between spiritual leaders must be a fearless, public, rational inquiry—questions answered with evidence, not authority. In practice, he says most leaders evade such encounter, hiding behind institutions and controlling media, speaking only to unquestioning followers. He challenges them to open debate before their own people, insisting that truth needs no protection and that hollow doctrines collapse under honest scrutiny.