To really realize the emptiness, first Shantideva said, only with the insight wisdom, only with the wisdom can penetrate the cause of impure perception, which is ego. Cause of the impure perception is our ego, our emotions. You can only penetrate them with the wisdom, wisdom of understanding that things does not exist truly. But this kind of insight wisdom can only happen when you have a really good shamata as a ground, as a foundation. So Shantideva said one must first apply shamata method before the vipassana. And even this shamata can only come when you have a proper renunciation and revulsion towards the samsara. Renunciation mind.