We need to know what it means by calm mind.
Calm mind doesn't mean no thougth.
A good meditator is like a person who is in the middle of the tornado. We can have thousand thoughts appearing in the mind, but we are not affected by it.
However, as long as we still do not know the true face of the thought, as long as that as well, we will be affected by the thought.
Once you can see the true face of the thought, which is essenceless, it will no longer disturb you and you no longer feel thoughts are disturbances. In fact, the thought will help you further to show you - look I am showing you the impermanence of myself. Don't misunderstand me as something real.
Once we can experience that again and again, the mind will calm.
We no longer can differentiate the state where no thoughts and with thoughts.
We experience the starting of no thought, the duration of no thought, and the end of no thought. Afterwards, we will experience the beginning of thought, the duration of thought, and the end of thought. This cycle will keep repeating.
So, if you look at it no difference at all between thoughts and no thoughts. They are same. No identity.
Some people expecting the state of no thoughts, because they think the state of no thoughts are good. This is not right. In fact, this wrong view cause attachment to the state of no thoughts and the meditation will never progress.
This is because we think the state of thoughtless and the state of thought are different. They are in fact same. Both have no essence. And both of them show us - look whether I am appearing or not appearing, I am essenceless. Don't misunderstand me by attaching to myself.
When we look at it thousand times, the wisdom of no essence can actually arise.
No essence has nothing to do with thought or appearances or no thought or no appearances.
No essence is simply no essence.
All of these slowly slowly by nature will calm your mind further. The mind itself will get clearer and clearer. The mind now has the ability to see through everything. If before it is block by thoughts by automatically engaging into its story, or the desire of no thoughts, now it can see through all of them as what they are without any single dot of the necessity to modify them. They are not harmful, they are impermanent, and they are in fact showing us all these wisdom. So, thanks to them. No need to modify them and just relax.
We cannot calm the mind by modifying it or push it to calm. The mind will automatically calm if you have the proper understanding and know what to do.
Don't worry about jhana or what. This reality has no jhana. This reality also has no name.
The state of breathing will stop soon or later. Breathing has limitation. Breathing is coarse. We cannot use breathing to go to jhana. Somewhere in the breathing, the breathing will change to the mind object (citta-sankhara). If we keep looking for breath after it is unnoticeable, you will actually back to the square. If you notice, once you breath starts to be unnoticeable, if you look for breath, your breath will suddenly noticeable again and become coarser. It means you are going back to the beginning, back to the square. You won't be able to go deeper.
Soon or later, we must leave the breathing behind and move to the mind.
From the mind, we can then go further to a state of very calm mind. This mind object has the ability to do so.
We use the mind to penetrate body, to penetrate mind itself, feeling, perception, etc.
Breathing cannot do vipassana. It is mind that can do vipassana. So, leave it behind once the breath give you a sign to leave it behind.
From vipassana insight it can help calming the mind further and strengthen whatever calm state you have reach. Both samantha and vipassana will then work hand in hand to cross all jhanas or whatever super jhanas.
You will reach a state where your mind sit still and doesn't want to move around. If before your mind voluntarily grasp here and there, now it is completely reversed. Now, it doesn't want to grasp this and that anymore, because the mind is clever enough don't want to be trick anymore by the story of thought. It will see that story as what it is without being polluted by it.
No separation between mind and thoughts. Unutterably, extremely calm, bright, and sharp without any grasping.
I am not here nor there.
I am not right nor wrong.
I do not exist neither non-exist.
I am not I nor non-I.
I am not in samsara nor nirvana.
To All Buddhas, I bow down for the teaching of emptiness. Thank You!