'not-self', non-ego, egolessness, impersonality,
is the last of the three characteristics of existence (ti-lakkhana, q.v.) The anattā doctrine teaches that neither within the bodily and mental phenomena of existence, nor outside of them, can be found anything that in the ultimate sense could be regarded as a self-existing real ego-entity, soul or any other abiding substance.
This is the central doctrine of Buddhism, without understanding which a real knowledge of Buddhism is altogether impossible. It is the only really specific Buddhist doctrine, with which the entire Structure of the Buddhist teaching stands or falls. All the remaining Buddhist doctrines may, more or less, be found in other philosophic systems and religions, but the anattā-doctrine has been clearly and unreservedly taught only by the Buddha, wherefore the Buddha is known as the anattā-vādi, or 'Teacher of Impersonality'.
Whosoever has not penetrated this impersonality of all existence, and does not comprehend that in reality there exists only this continually self-consuming process of arising and passing bodily and mental phenomena, and that there is no separate ego-entity within or without this process, he will not be able to understand Buddhism, i.e. the teaching of the 4 Noble Truths (sacca, q.v.), in the right light. He will think that it is his ego, his personality, that experiences suffering, his personality that performs good and evil actions and will be reborn according to these actions, his personality that will enter into Nibbāna, his personality that walks on the Eightfold Path. Thus it is said in Vis.M. XVI:
"Mere suffering exists, no sufferer is found;
The deeds are, but no doer of the deeds is there;
Nibbāna is, but not the man that enters it;
The path is, but no traveler on it is seen."
Here's a Sutta that helps understanding Anatta
natta-lakkhana Sutta: The Discourse on the Not-self Characteristic SN 22.59.
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."
"Is feeling permanent or impermanent?...
"Is perception permanent or impermanent?...
"Are determinations permanent or impermanent?...
"Is consciousness permanent or impermanent?" — "Impermanent, venerable sir." — "Now is what is impermanent pleasant or painful?" — "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."
"So, bhikkhus any kind of form whatever, whether past, future or presently arisen, whether gross or subtle, whether in oneself or external, whether inferior or superior, whether far or near, must with right understanding how it is, be regarded thus: 'This is not mine, this is not I, this is not myself.'
"Any kind of feeling whatever...
"Any kind of perception whatever...
"Any kind of determination whatever...
"Any kind of consciousness whatever, whether past, future or presently arisen, whether gross or subtle, whether in oneself or external, whether inferior or superior, whether far or near must, with right understanding how it is, be regarded thus: 'This is not mine, this is not I, this is not my self.'
"Bhikkhus, when a noble follower who has heard (the truth) sees thus, he finds estrangement in form, he finds estrangement in feeling, he finds estrangement in perception, he finds estrangement in determinations, he finds estrangement in consciousness.
"When he finds estrangement, passion fades out. With the fading of passion, he is liberated. When liberated, there is knowledge that he is liberated. He understands: 'Birth is exhausted, the holy life has been lived out, what can be done is done, of this there is no more beyond.'"
That is what the Blessed One said. The bhikkhus were glad, and they approved his words.
Now during this utterance, the hearts of the bhikkhus of the group of five were liberated from taints through clinging no more.
is the last of the three characteristics of existence (ti-lakkhana, q.v.) The anattā doctrine teaches that neither within the bodily and mental phenomena of existence, nor outside of them, can be found anything that in the ultimate sense could be regarded as a self-existing real ego-entity, soul or any other abiding substance.
This is the central doctrine of Buddhism, without understanding which a real knowledge of Buddhism is altogether impossible. It is the only really specific Buddhist doctrine, with which the entire Structure of the Buddhist teaching stands or falls. All the remaining Buddhist doctrines may, more or less, be found in other philosophic systems and religions, but the anattā-doctrine has been clearly and unreservedly taught only by the Buddha, wherefore the Buddha is known as the anattā-vādi, or 'Teacher of Impersonality'.
Whosoever has not penetrated this impersonality of all existence, and does not comprehend that in reality there exists only this continually self-consuming process of arising and passing bodily and mental phenomena, and that there is no separate ego-entity within or without this process, he will not be able to understand Buddhism, i.e. the teaching of the 4 Noble Truths (sacca, q.v.), in the right light. He will think that it is his ego, his personality, that experiences suffering, his personality that performs good and evil actions and will be reborn according to these actions, his personality that will enter into Nibbāna, his personality that walks on the Eightfold Path. Thus it is said in Vis.M. XVI:
"Mere suffering exists, no sufferer is found;
The deeds are, but no doer of the deeds is there;
Nibbāna is, but not the man that enters it;
The path is, but no traveler on it is seen."
Here's a Sutta that helps understanding Anatta
natta-lakkhana Sutta: The Discourse on the Not-self Characteristic SN 22.59.
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."
"Is feeling permanent or impermanent?...
"Is perception permanent or impermanent?...
"Are determinations permanent or impermanent?...
"Is consciousness permanent or impermanent?" — "Impermanent, venerable sir." — "Now is what is impermanent pleasant or painful?" — "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."
"So, bhikkhus any kind of form whatever, whether past, future or presently arisen, whether gross or subtle, whether in oneself or external, whether inferior or superior, whether far or near, must with right understanding how it is, be regarded thus: 'This is not mine, this is not I, this is not myself.'
"Any kind of feeling whatever...
"Any kind of perception whatever...
"Any kind of determination whatever...
"Any kind of consciousness whatever, whether past, future or presently arisen, whether gross or subtle, whether in oneself or external, whether inferior or superior, whether far or near must, with right understanding how it is, be regarded thus: 'This is not mine, this is not I, this is not my self.'
"Bhikkhus, when a noble follower who has heard (the truth) sees thus, he finds estrangement in form, he finds estrangement in feeling, he finds estrangement in perception, he finds estrangement in determinations, he finds estrangement in consciousness.
"When he finds estrangement, passion fades out. With the fading of passion, he is liberated. When liberated, there is knowledge that he is liberated. He understands: 'Birth is exhausted, the holy life has been lived out, what can be done is done, of this there is no more beyond.'"
That is what the Blessed One said. The bhikkhus were glad, and they approved his words.
Now during this utterance, the hearts of the bhikkhus of the group of five were liberated from taints through clinging no more.
