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The understanding of annata came from the teachings of Gautama Buddha. In many of his discourses he explains about the impermanent nature of body, feelings, perceptions, mental fabrications and consiousness. Clinging to them is useless as craving.

Mindfulness and meditation is where this understanding becomes tangible and observable far from metaphysical entanglements...

As an example, the careful contemplation of this discourses -between others- has been of good help:

Thus I heard. On one occasion the Blessed One was living at Benares, in the Deer Park at Isipatana (the Resort of Seers). There he addressed the bhikkhus of the group of five: "Bhikkhus." — "Venerable sir," they replied. The Blessed One said this.

"Bhikkhus, form is not-self. Were form self, then this form would not lead to affliction, and one could have it of form: 'Let my form be thus, let my form be not thus.' And since form is not-self, so it leads to affliction, and none can have it of form: 'Let my form be thus, let my form be not thus.'

"Bhikkhus, feeling is not-self...

"Bhikkhus, perception is not-self...

"Bhikkhus, determinations are not-self...

"Bhikkhus, consciousness is not self. Were consciousness self, then this consciousness would not lead to affliction, and one could have it of consciousness: 'Let my consciousness be thus, let my consciousness be not thus.' And since consciousness is not-self, so it leads to affliction, and none can have it of consciousness: 'Let my consciousness be thus, let my consciousness be not thus.'

"Bhikkhus, how do you conceive it: is form permanent or impermanent?" — "Impermanent, venerable Sir." — "Now is what is impermanent painful or pleasant?" — "Painful, venerable Sir." — "Now is what is impermanent, what is painful since subject to change, fit to be regarded thus: 'This is mine, this is I, this is my self'"? — "No, venerable sir."

[...]

Anatta-lakkhana Sutta
"Monks, I will teach you craving: the ensnarer that has flowed along, spread out, and caught hold, with which this world is smothered & enveloped like a tangled skein, a knotted ball of string, like matted rushes and reeds, and does not go beyond transmigration, beyond the planes of deprivation, woe, & bad destinations. Listen well, and I will speak."

"Yes, lord," the monks responded.

The Blessed One said: "And which craving is the ensnarer that has flowed along, spread out, and caught hold, with which this world is smothered & enveloped like a tangled skein, a knotted ball of string, like matted rushes and reeds, and does not go beyond transmigration, beyond the planes of deprivation, woe, & bad destinations? These 18 craving-verbalizations[1] dependent on what is internal and 18 craving-verbalizations dependent on what is external.

"And which are the 18 craving-verbalizations dependent on what is internal? There being 'I am,' there comes to be 'I am here,' there comes to be 'I am like this' ... 'I am otherwise' ... 'I am bad' ... 'I am good' ... 'I might be' ... 'I might be here' ... 'I might be like this' ... 'I might be otherwise' ... 'May I be' ... 'May I be here' ... 'May I be like this' ... 'May I be otherwise' ... 'I will be' ... 'I will be here' ... 'I will be like this' ... 'I will be otherwise.' These are the 18 craving-verbalizations dependent on what is internal.

"And which are the 18 craving-verbalizations dependent on what is external?

[...]

Tanha Sutta: Craving
Rahula, whatever form... feeling... perception... formation... consciousness - whether past, future or present, internal or external, gross or subtle, inferior or superior, far or near, all consciousnesses should be seen as it is with right wisdom thus:

"This is not mine, this is I am not, this is not my self"

SN 18.21