We need to know what are the end results of contemplating these 4 tetrad. Then our daily life experience becomes the witness that support the end of the contemplation. In this case, you will be able to integrating all these 4 tetrad.
For example: Let's take this body.
Now, let's say we have lived for 50 years. It is for 50 years we have always this notion and feeling: This is a body, and this is my body.
If your contemplation running very well, at the end of your vipassana, you will have a very distinct feeling of reality that: This is just labeled as a body, and it is impossible I can have a body. Afterwards, in your daily life, whatever movement you make within your body, it becomes a living fact that enhance your intuitive even further that actually it is really impossible you can have a body.
There is an indication, when you can integrate this. In your daily life you will feel extremely light.
You may argue for example: It is not possible we don't have body. I can move my hand, my legs, my head, etc. So, this is my body.
Please note here:
When we say we don't have body, it doesn't mean the hand, leg,etc, disappear. THat is not the meaning of you don't have body.
We are like a person who have this notion that the tree over there is my body. We carry this tree for 50 years, and we always think that the tree is also my body. We have this feeling, even a dream that tree also appear as a part of this body. But, at the time you realize that the tree is not your body, at that moment you have a sense of great release. By knowing the fact that the tree is not your body, doesn't change the fact the physical tree is still there. But, it indeed change your view about this life.
If before when you still regard that tree is your body, any damage to that tree, automatically give you a huge suffering. But, when you realize that tree is not your body, any damage to that tree, you will be ok. Whatever thing happen it is really not a big deal. You always in a great release feeling.
Now, when you see this body, the biggest problem is we have this strong intuitive, this is body. This is something we never question.
Yes, there is a fact that there are these limbs. But, why we make these limbs as mine and as body? This is like a question why I make the tree over there as mine and as my body?
Even let say we know later that this body is not a body, it doesn't mean you are free from the intuitive that I don’t have this body.
If you see a baby, the baby doesn't have this in his head. He doesn't have : "This is my body". He doesnt have that thought, that running in his mind telling a story "this is my body". He doesn't have that thought. But although he doesn't have that, he indeed has this NONCONCEPTUAL notion (intuitive) - I have this body. He has this Unlabel intuitive running in his mind - I have that.
Baby doesn’t have the story: This is body. As an adult, we have that story or that thought. But, although we can eliminate that thought saying this is body, it doesn’t mean you are really free from having this intuitive that you really don’t have this body.
The most important thing we need to get rid of is actually this feeling (intuition) that I have a body.
In reality, It is impossible we can have a body.
If you see sand on the beach, you can form the sand into the sand castle, you can make it with human shape, a ball, etc. There are so many shapes.
But you ask yourself:
What is the specific shape of the sand?
It doesn’t have and it can’t have it.
If sand has a specific shape - let's say like a ball, we will not be able to make it like a sand castle, like human shape, etc. If we see the particle of sand, it looks like a ball, but because naturally it doesn't have a specific shape, it can reshape it to a square, triangle, etc.
If sand has a specific shape - for example like a ball, no matter how hard to try to reshape it, you will fail.
Not only sand, everything in this universe, none of them has a specific shape. None.
If you see this body, this body also doesn't have and cannot have a specific shape. If you have a specific shape, you cannot have a snake shape when you are reborn in animal realm. You will not have a crocodile shape.
If you can have a specific body, when you are born in the formless realm, your body will follow you.
Your body will never ever change.
Because we never have a specific body, that is why these small arm can grow. This belly can get bigger.
If you have a specific body, your specific body will constrain all these movement, all these growths, all the decays. The specific body will constrain all of them.
All daily life movements are actually the real and best fact that show you, you actually do not have a body. Even you want to dream to have a body, these limbs, these blood can never ever become your body.
Why we can’t have a body? It is because you don't have and cannot have a specific body.
If you can’t show your specific body, why you still think you have a body?
You really do not have a body. Not even now, with the presence of these limbs and blood.
If your daily experience can show you this fact, you have integrated it to your life. Day by day, daily life experience will just enhance and confirm you this reality.
Your belly can grow bigger is the fact that shows you don't have a body.
Your arm can grow is the fact that shows you don't have a body.
No specific body is the fact that show you, you can't have a body.
Reality has shown us this. This is the sign that reality show us. Why we are still blind with all these signs?
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!