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If however their accumulated sin during the human birth is high, then they could become  dog, pig or a चाण्डालः || chandala (outcaste). Thus, those souls who are attached to worldly pleasures but do not do things prohibited by Vedas attain Pitruloka.  After enjoying all the accrued punya there, they return back to earth through the Pitruyana marg.  <blockquote>अथैतयोः पथोर्न कतरेण च न तानीमानि क्षुद्राण्यसकृदावर्तीनि भूतानि भवन्ति जायस्व म्रियस्वेत्येतत्तृतीयँस्थानं तेनासौ लोको न सम्पूर्यते तस्माज्जुगुप्सेत तदेष श्लोकः ॥ ८ ॥ (Chan. Upan. 5.10.8)</blockquote><blockquote>athaitayoḥ pathorna katareṇa ca na tānīmāni kṣudrāṇyasakṛdāvartīni bhūtāni bhavanti jāyasva mriyasvetyetattṛtīyam̐sthānaṃ tenāsau loko na sampūryate tasmājjugupseta tadeṣa ślokaḥ ॥ 8 ॥ (Chan. Upan. 5.10.8)</blockquote>The jivatma of one who does not follow the injunctions of shastras are involved in पापोपासना ॥ papopasana. Leading a wayward life, they do not attain the higher realms and do not traverse either of these paths, the देवयानम् and पितृयानम्. Such souls are reborn time and again in the lower species of life owing to their great sins attaining a place called Trteeya. Therefore Pitru loka is not filled all the time.   

If however their accumulated sin during the human birth is high, then they could become  dog, pig or a चाण्डालः || chandala (outcaste). Thus, those souls who are attached to worldly pleasures but do not do things prohibited by Vedas attain Pitruloka.  After enjoying all the accrued punya there, they return back to earth through the Pitruyana marg.  <blockquote>अथैतयोः पथोर्न कतरेण च न तानीमानि क्षुद्राण्यसकृदावर्तीनि भूतानि भवन्ति जायस्व म्रियस्वेत्येतत्तृतीयँस्थानं तेनासौ लोको न सम्पूर्यते तस्माज्जुगुप्सेत तदेष श्लोकः ॥ ८ ॥ (Chan. Upan. 5.10.8)</blockquote><blockquote>athaitayoḥ pathorna katareṇa ca na tānīmāni kṣudrāṇyasakṛdāvartīni bhūtāni bhavanti jāyasva mriyasvetyetattṛtīyam̐sthānaṃ tenāsau loko na sampūryate tasmājjugupseta tadeṣa ślokaḥ ॥ 8 ॥ (Chan. Upan. 5.10.8)</blockquote>The jivatma of one who does not follow the injunctions of shastras are involved in पापोपासना ॥ papopasana. Leading a wayward life, they do not attain the higher realms and do not traverse either of these paths, the देवयानम् and पितृयानम्. Such souls are reborn time and again in the lower species of life owing to their great sins attaining a place called Trteeya. Therefore Pitru loka is not filled all the time.   

== ब्रह्मसूत्राणि ॥ Brahmasutras ==

== ब्रह्मसूत्राणि ॥ Brahmasutras ==

Brahmasutras extensively and intricately describe the path of the Soul after Jeevan mukti and Videha mukti.  <blockquote>तदन्तरप्रतिपत्तौ रंहति सम्परिष्वक्तः प्रश्ननिरूपणाभ्याम् || (Bram. Sutr. 3.1.1)<ref name=":5">[https://sanskritdocuments.org/doc_z_misc_major_works/brahma_suutra.html Brahmasutras] By Maharshi Vedavyasa</ref></blockquote><blockquote>Tadantarapratipattau raṁhati sampariṣvaktaḥ praśnanirūpaṇābhyām || (Bram. Sutr. 3.1.1)</blockquote>Meaning : When the transmigration of the soul takes place, the living being enters into the new body along with the subtle elements- मनस || manasa (mind), बुद्धि || buddhi (intellect) and अहङ्कार || ahankara (ego). This is corroborated in the Upanishads.<ref>Brahmasutras By Swami Sivananda ([https://www.swami-krishnananda.org/bs_3/bs_3-1-01.html 3.1.1])</ref>

Brahmasutras extensively and intricately describe the path of the Soul after जीवन्मुक्तिः ॥ Jeevan mukti and विदेहमुक्तिः ॥ Videha mukti.  <blockquote>तदन्तरप्रतिपत्तौ रंहति सम्परिष्वक्तः प्रश्ननिरूपणाभ्याम् || (Bram. Sutr. 3.1.1)<ref name=":5">[https://sanskritdocuments.org/doc_z_misc_major_works/brahma_suutra.html Brahmasutras] By Maharshi Vedavyasa</ref></blockquote><blockquote>Tadantarapratipattau raṁhati sampariṣvaktaḥ praśnanirūpaṇābhyām || (Bram. Sutr. 3.1.1)</blockquote>Meaning : When the transmigration of the soul takes place, the living being enters into the new body along with the subtle elements - मनस् || manas (mind), बुद्धिः || buddhi (intellect) and अहङ्कारः || ahankara (ego). This is corroborated in the Upanishads.<ref>Brahmasutras By Swami Sivananda ([https://www.swami-krishnananda.org/bs_3/bs_3-1-01.html 3.1.1])</ref>

The Devayana and Pitrayana is described in the Brahmasutras in the 4th chapter (phaladhyaya), 2nd section. The mode of departure from the body up to the way is common to both the knower of the Saguna Brahman and an ordinary man  <blockquote>समाना चासृत्युपक्रमादमृतत्वं चानुपोष्य (Bram. Sut. 4.2.7)<ref name=":5" /></blockquote>Meaning : And common (is the mode of departure at the time of death for both the knower of the Saguna Brahman and the ignorant) up to the beginning of their ways; and the immortality (of the knower of the Saguna Brahman is only relative) without having burnt (ignorance). The present Sutra says that the knower of the Saguna Brahman enters the Sushumna Nadi at death and then goes out of the body and then enters the Devayana or the path of the gods while the ordinary ignorant man enters some other Nadi and goes by another way to have rebirth.<ref name=":0">Brahmasutras By Swami Sivananda ([https://www.swami-krishnananda.org/bs_4/bs_4-2-04.html 4.2.7])</ref>

The Devayana and Pitruyana is described in the Brahmasutras in the 4th chapter (फलाध्यायः ॥ phaladhyaya), 2nd section. The mode of departure from the body up to the way is common to both the knower of the सगुण-ब्रह्मन् ॥ Saguna Brahman and an ordinary man. <blockquote>समाना चासृत्युपक्रमादमृतत्वं चानुपोष्य (Bram. Sut. 4.2.7)<ref name=":5" /></blockquote><blockquote>samānā cāsṛtyupakramādamṛtatvaṃ cānupoṣya (Bram. Sut. 4.2.7)</blockquote>Meaning : And common (is the mode of departure at the time of death for both the knower of the Saguna Brahman and the ignorant) up to the beginning of their ways; and the immortality (of the knower of the Saguna Brahman is only relative) without having burnt (ignorance). The present Sutra says that the knower of the Saguna Brahman enters the सुशुम्ना-नाडी ॥ Sushumna Nadi at death and then goes out of the body and then enters the Devayana or the path of the gods while the ordinary ignorant man enters some other Nadi and goes by another way to have rebirth.<ref name=":0">Brahmasutras By Swami Sivananda ([https://www.swami-krishnananda.org/bs_4/bs_4-2-04.html 4.2.7])</ref>

But the mode of departure at death is common to both till they enter on their respective ways.

But the mode of departure at death is common to both till they enter on their respective ways.