Bondage remains bondage, be it from a chain made of gold or one made of copper or iron.
So, even a pure, calm nature causes bondage, and in the end you have to get rid of this also. You must free yourself from all bondage. But until you reach divinity you need the pure, calm, harmonious quality. Once you merge in the Lord, there are no more distinguishing qualities of any kind. In that state the question of the three qualities does not arise at all.