The Conception of Emptiness in Mahayana Buddhism:
In Mahayana tradition, the emptiness was developed after the Buddha. It’s developed by Nagarajuna, the leader of Mahayana Buddhism. They used the word of sunyata as empty of something. I think it’s similar to the word of impermanent which Theravada used to. However, let’s see as the followings what Mahayana has given the expression of it.
Emptiness is the emptiness of inherent existence of the mind. It is a changing mind. All sentient beings have within them the Buddha nature. Here, it means that all sentient beings have minds which can change and became the Buddha’s mind.