Your points are good but I will advise you to understand this point. The Bhagavad Gita is a philosophical text, hard to understand.
Topic of the Ch-8 is Discourse on Immutable Brahman.
Verse no 8.5-8.10 should be taken together.
And at the time of death, anyone who departs by giving up the body while thinking of Me alone, he attains My state. There is no doubt
O son of Kuntī, thinking of any entity whichever it may be one gives up the body at the end, he attains that very one, having been always
engrossed in its thought.-6
Therefore, think of Me at all times and fight. There is no doubt that by dedicating your mind and intellect to Me, you will attain Me
O son of Prthā, by meditating with a mind which is engaged in the Yog of practice and which does not stray away to anything else, one
reaches the supreme Person existing in the effulgent region.-8
He who meditates on the Omniscient, the Ancient, the Ruler, subtler than the subtle, the Ordainer of everything, of inconceivable form,
effulgent like the sun, and beyond darkness—(he attains the supreme
At the time of death, having fully fixed the Prana (vital force) between the eyebrows with an unswerving mind, and being imbued with
devotion as also the strength of concentration, he reaches that
resplendent supreme Person.-10
Commentary of Adi-Shankaracharya
Verse no 8.5-8.10
And at the time of death anyone who departs by
giving up the body while thinking of Me alone, who am the supreme
Bhagavān Visnu he attains My state, the Reality that is Visnu. There
is no doubt about this, in this regard, as to whether he attains (Me)
or not. ‘This rule does not apply in relation to me alone.’ ‘What
O Son of Kunti thinking of any entity, any particular deity whichever
it may be one gives up; the body at the end, at the time of the
departure of life he attains that very one, that very entity which is
remembered—none else; having been always engrossed in its thought.
Engrossment in it is one by whom that is remembered as a matter of
habitual recollection is tadbhāva-bhāvitah. Since the last thought is
thus the cause of acquiring the next body—
Therefore, think of Me, in the way prescribed by the scripture at all
times; and fight, engage yourself in war, which is your own (varna)
duty. There is no doubt in this matter that by dedicating your mind
and intellect to Me you—you who have thus dedicated your mind and
intellect to Me,Vāsudeva—will attain Me alone, as I shall be
O son of Prthā by meditating, that is contemplating in accordance with
(anu) the instruction of teachers and scriptures with a mind engaged
in the Yog of practice—abhyāsa, practice, consists in the repetition
of the same kind of thought, uninterrupted by any contrary idea, with
regard to Me who am the object of concentration of the mind; that
practice itself is Yog; the mind of a yogī is engrossed (yuktam) in
that itself; with a mind that is such, and which does not stray away
to anything else which is not inclined to go away to any other object
one reaches; the supreme, unsurpassed Person existing in the effulgent
region (divi), in the Solar Orb. And, to what kind of a Person does he
go? This is being stated:
He who, anyone who meditates on; kavim, the Omniscient, the Knower of
things past, present and future, the Ancient, the Eternal, the Ruler,
the Bhagavān of the whole Universe, subtler than the subtle, the
Ordainer of everything—one who grants the fruits of actions, in all
their varieties, individually to all creatures who is of inconceivable
form—His form, though always existing, defies being conceived of by
anybody, who is effulgent like the sun, who is manifest as eternal
Consciousness like the effulgence of the sun and beyond
darkness—beyond the darkness of delusion in the form of ignorance—(he
attains the supreme Person). This verse is to be connected with the
earlier itself thus: ‘by meditating (on Him) ... he attains Him.’
At the time of death; after first bringing the mind under control in
the lotus of the heart, and then lifting up the vital force—through
the nerve going upward—by gradually gaining control over (the
rudiments of nature such as) earth etc. and after that, having fully
fixed; prānam, the Prāna (vital force) between; the eye-brows, without
losing attention with an unwavering mind; he, the yogī possessed of
such wisdom, with devotion, deep as also; with the strength of
concentration— i.e. imbued with that (strength) also, consisting in
the steadfastness of the mind arising from the accumulation of
impressions resulting from spiritual absorption reaches that
resplendent supreme Person, described as ‘the Omniscient, the
- Then is it not the best to commit suicide by some means which is painless and remember Krishna so that we can attain Moksha ? Because letting yourself dying naturally is risky as most deaths are painful and generally it is very hard to remember God at the time of death for most people.
Ans- No running away from your duty and karma is never a solution. In verse no 8.7(Therefore, think of Me at all times and fight..) here Shri Krishna is clearly telling Arjuna to not run away from your duty. The reason why Shri Krishna gave the knowledge of the Gita to Arjuna was because he was running away from doing Karma as per his duty. If you think that by suicide you will get Moksha then it is wrong and ignorant. Yes, remembering Shri Krishna at the end can grant you the Moksha but the thought of the seeker must be pure and complete devotion, the way a yogi remembers the God and with full concentration (see verses no 8.8 and 8.10 and also 4th and last para of commentary).
And I don't think that one can develop such deep concentration in one go.
- What is use of doing good karma throughout one's life when our next destination will be determined only by our last moment of death?
Ans- I think I have covered this in the last answer but still, I will repeat--Yes, your last moment decides where you will go, precisely it's the pureness at the last moment that decides your next destination.
Karma is very important; every second we do actions(karma) this land is the land of Karma. The reason that Shri Krishna said all this to Arjuna is because he was refraining from action(karma). The 3rd Ch of Gita is all about Karma yoga. It is good Karma(action) that results in pureness.