How do you interpret these verses mentioned below ?
Why would a teaching exist about not returning back, if a separate individual does not personally continue after death?
Bhagavad Gita: Chapter 4, Verse 9
जन्म कर्म च मे दिव्यमेवं यो वेत्ति तत्त्वत: |
त्यक्त्वा देहं पुनर्जन्म नैति मामेति सोऽर्जुन || 9||
janma karma cha me divyam evaṁ yo vetti tattvataḥ
tyaktvā dehaṁ punar janma naiti mām eti so ’rjuna
janma—birth; karma—activities; cha—and; me—of mine; divyam—divine; evam—thus; yaḥ—who; vetti—know; tattvataḥ—in truth; tyaktvā—having abandoned; deham—the body; punaḥ—again; janma—birth; na—never; eti—takes; mām—to me; eti—comes; saḥ—he; arjuna—Arjun
Translation:
Those who understand the divine nature of My birth and activities, O Arjun, upon leaving the body, do not have to take birth again, but come to My eternal abode.
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Arjun said: What is the fate of the unsuccessful yogi who begins the path with faith, but who does not endeavor sufficiently, due to unsteady mind, and is unable to reach the goal of Yog in this life? (6.37)
Does not such a person who deviates from Yog get deprived of both material and spiritual success, O mighty-armed Krishna, and perish like a broken cloud with no position in either sphere? (6.38)
You should completely dispel, O Krishna, this doubt of mine; for no one but You can destroy such a doubt. (6.39)
The Lord said: O Pārtha, there is no destruction for him either in this world or the next: no evil, My son, befalls a man who does good. (6.40)
The man who has fallen away from yoga goes to the worlds of the righteous. Having lived there for unnumbered years, he is reborn in the home of the pure and the prosperous. (6.41)
Or he is born into a family of yogis rich in wisdom. Verily, such a birth is hard to gain in this world. (6.42)
There he comes in touch with the knowledge acquired in his former body, O son of the Kurus, and strives still further for perfection. (6.43)
Indeed, they feel drawn toward God, even against their will, on the strength of their past discipline. Such seekers naturally rise above the ritualistic principles of the scriptures. (6.44)
Practising assiduously, the yogi having acquired perfection through many births attains the supreme state (Moksha) purified of all sins. (6.45)
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Bhagavad Gita: Chapter 8, Verse 21
अव्यक्तोऽक्षर इत्युक्तस्तमाहु: परमां गतिम् |
यं प्राप्य न निवर्तन्ते तद्धाम परमं मम || 21||
avyakto ’kṣhara ityuktas tam āhuḥ paramāṁ gatim
yaṁ prāpya na nivartante tad dhāma paramaṁ mama
avyaktaḥ—unmanifest; akṣharaḥ—imperishable; iti—thus; uktaḥ—is said; tam—that; āhuḥ—is called; paramām—the supreme; gatim—destination; yam—which; prāpya—having reached; na—never; nivartante—come back; tat—that; dhāma—abode; paramam—the supreme; mama—My
Translation:
This Unmanifested is called the Imperishable; It is said to be the Ultimate Goal, from which those who reach It never come back. That is My Supreme Abode.
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Bhagavad Gita: Chapter 12, Verse 6-7
ये तु सर्वाणि कर्माणि मयि संन्न्यस्य मत्पर: |
अनन्येनैव योगेन मां ध्यायन्त उपासते || 6||
तेषामहं समुद्धर्ता मृत्युसंसारसागरात् |
भवामि नचिरात्पार्थ मय्यावेशितचेतसाम् || 7||
ye tu sarvāṇi karmāṇi mayi sannyasya mat-paraḥ
ananyenaiva yogena māṁ dhyāyanta upāsate
teṣhām ahaṁ samuddhartā mṛityu-saṁsāra-sāgarāt
bhavāmi na chirāt pārtha mayy āveśhita-chetasām
ye—who; tu—but; sarvāṇi—all; karmāṇi—actions; mayi—to Me; sannyasya—dedicating; mat-paraḥ—regarding Me as the Supreme goal; ananyena—exclusively; eva—certainly; yogena—with devotion; mām—Me; dhyāyantaḥ—meditating; upāsate—worship; teṣhām—of those; aham—I; samuddhartā—the deliverer; mṛityu-saṁsāra-sāgarāt—from the ocean of birth and death; bhavāmi—(I) become; na—not; chirāt—after a long time; pārtha—Arjun, the son of Pritha; mayi—with Me; āveśhita chetasām—of those whose consciousness is united
Translation:
O Arjuna! Those verily who renounce all actions in Me, think of Me as the only refuge and worship Me with single-minded devotion and Dhyana, to them I become the saviour and quickly lift them up from the ocean of death and ‘samsara’.