Advancement of spiritual knowledge means more and more liberation. But our problem is how to liberate ourselves from this material bondage. We are bound up. Just like I am a spirit soul, you are spirit soul, but we are put into this material bondage. Because we are in material bondage, therefore we have no freedom. People do not understand this. Just like spirit soul is described as sarva-ga. Sarva-ga means the spirit soul can go anywhere he likes. But due to this material bondage, because we have this material body, we are checked. Even we cannot go to the other planet. But we have got instances... Just like Nārada Muni. Nārada Muni is traveling all over the universes, not only within the material world, but in the spiritual world, because he has got spiritual body. There is no material bondage.