BG 4.9- One who knows the transcendental nature of My appearance and activities does not, upon leaving the body, take his birth again in this material world, but attains My eternal abode, O Arjuna.”

OK-Do we think we understand this important verse above from BG?? See below...

SB 6.17.30-As one mistakenly considers a flower garland to be a snake or experiences happiness and distress in a dream, so, in the material world, by a lack of careful consideration, we differentiate between happiness and distress, considering one good and the other bad.
PURPORT-The happiness and distress of the material world of duality are both mistaken ideas. In the Caitanya-caritāmṛta (Antya 4.176) it is said: ”dvaite” bhadrābhadra-jñāna, sabamanodharma””ei bhāla, ei manda”, ei saba ”bhrama”
The distinctions between happiness and distress in the material world of duality are simply mental concoctions, for the so-called happiness and distress are actually one and the same. They are like the happiness and distress in dreams. A sleeping man creates his happiness and distress by dreaming, although actually they have no existence.
The other example given in this verse is that a flower garland is originally very nice, but by mistake, for want of mature knowledge, one may consider it a snake. In this connection there is a statement by Prabodhānanda Sarasvatī: viśvaṁ pūrṇa-sukhāyate. Everyone in this material world is distressed by miserable conditions, but Śrīla Prabodhānanda Sarasvatī says that this world is full of happiness. How is this possible? He answers, yat-kāruṇya-katākṣa-vaibhavavatāṁ taṁ gauram eva stumaḥ. A devotee accepts the distress of this material world as happiness only due to the causeless mercy of Śrī Caitanya Mahāprabhu. By His personal behavior, Śrī Caitanya Mahāprabhu showed that He was never distressed but always happy in chanting the Hare Kṛṣṇa mahā-mantra. One should follow in the footsteps of Śrī Caitanya Mahāprabhu and engage constantly in chanting the mahā-mantra—Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. Then he will never feel the distresses of the world of duality. In any condition of life one will be happy if he chants the holy name of the Lord.
In dreams we sometimes enjoy eating sweet rice and sometimes suffer as if one of our beloved family members had died. Because the same mind and body exist in the same material world of duality when we are awake, the so-called happiness and distress of this world are no better than the false, superficial happiness of dreams. The mind is the via medium in both dreams and wakefulness, and everything created by the mind in terms of saṅkalpa and vikalpa, acceptance and rejection, is called manodharma, or mental concoction.
SB 6.17.31-Persons engaged in devotional service to Lord Vāsudeva, Kṛṣṇa, have naturally perfect knowledge and detachment from this material world. Therefore such devotees are not interested in the so-called happiness or so-called distress of this world.
PURPORT-Here is the distinction between a devotee and a philosopher who speculates on the subject matter of transcendence. A devotee does not need to cultivate knowledge to understand the falsity or temporary existence of this material world. Because of his unalloyed devotion to Vāsudeva, this knowledge and detachment are automatically manifested in his person. As confirmed elsewhere in Śrīmad-Bhāgavatam
(1.2.7): vāsudeve bhagavati bhakti-yogaḥ prayojitaḥ
janayaty āśu vairāgyaṁ jñānaṁ ca yad ahaitukam
One who engages in unalloyed devotional service to Vāsudeva, Kṛṣṇa, automatically becomes aware of this material world, and therefore he is naturally detached. This detachment is possible because of his high standard of knowledge. The speculative philosopher tries to understand that this material world is false by cultivating knowledge, but this understanding is automatically manifested in the person of a devotee, without separate endeavor. The Māyāvādī philosophers may be very proud of their so-called knowledge, but because they do not understand Vāsudeva (vāsudevaḥ sarvam iti [Bg. 7.19]), they do not understand the world of duality, which is a manifestation of Vāsudeva’s external energy. Therefore, unless the so-called jñānīs take shelter of Vāsudeva, their speculative knowledge is imperfect. Ye ’nye ’ravindākṣa vimukta-māninaḥ. They simply think of becoming free from the contamination of the material world, but because they do not take shelter at the lotus feet of Vāsudeva, their knowledge is impure. When they actually become pure, they surrender to the lotus feet of Vāsudeva. Therefore, the Absolute Truth is easier to understand for a devotee than for jñānīs who simply speculate to understand Vāsudeva. Lord Śiva confirms this statement in the following verse.
Some Conclusions---I very much like what Srila Prabhupada writes about material sense gratification of so called happiness and distress.... “In dreams we sometimes enjoy eating sweet rice and sometimes suffer as if one of our beloved family members had died. Because the same mind and body exist in the same material world of duality when we are awake, the so-called happiness and distress of this world are no better than the false, superficial happiness of dreams. The mind is the via medium in both dreams and wakefulness, and everything created by the mind in terms of saṅkalpa and vikalpa, acceptance and rejection, is called manodharma, or mental concoction.”
This means in other words, that what we consider and know to be false in dreams is the same falsity we are aware of in daily waking state because both states are created by the same mind and body. If we can accept the dreams of happiness and distress to be false or temporary, then why not the wakeful state also? But we dont generally as we accept daily life to be "real"-why? Because it lasts longer than the dreams at night?
The very first verse in this article from BG states that if we know about the appearance and pastimes of Krsna when He appears, then we wont be taking birth again. So does this mean we simply understand the “story” as relayed in Krsna Book about the Lords appearance and that so called “understanding” guarantees our next birth in Vaikuntha? No- and here is the reason why.
One who engages in unalloyed devotional service to Vāsudeva, Kṛṣṇa, automatically becomes aware of this material world, and therefore he is naturally detached. This detachment is possible because of his high standard of knowledge.
...Also... they do not understand the world of duality, which is a manifestation of Vāsudeva’s external energy. Therefore, unless the so-called jñānīs take shelter of Vāsudeva, their speculative knowledge is imperfect.
So the conclusion from above is this-If we are still affected by the world of duality, happiness and distress etc, that means we still do not understand the Transcendental appearance of the Lord, being ourselves still affected by this world of duality. The beginning stages of understanding means we must be engaged in unalloyed bhakti, which produces detachment from matter, which means we are no longer affected by this world of duality, which means in THAT state we can understand Krsna and His pastimes. 
The first stages of being un affected by duality are this from BG-18.54-
One who is thus transcendentally situated at once realizes the Supreme Brahman. He never laments nor desires to have anything; he is equally disposed to every living entity. In that state he attains pure devotional service unto Me.  
So let us keep chanting and pray for the Lords mercy upon us....

Hare Krsna
Damaghosa das

Hare Krishna Hare Krishna Krishna Krishna Hare Hare

Hare Rama Hare Rama Rama Rama Hare Hare