The basic purpose of the Osho talks is to provide an opportunity for the listener to experience meditation. And listening is very different from just 'hearing.'
In this way, these talks are unique. They are basically an experiment, and the listeners are the experimenters.
Just as the Active Meditations are a bridge to help restless modern people enjoy a taste of meditation, so too, talking is used as a way of solving the oldest dilemma in the history of meditation – how to experience silence with no effort.
Meditation is often taught as something you 'do' for a certain length of time a day...Osho has something to say about that too. At which point....
And the final point – the path that never ends, the reality that goes on growing.