Discriminate whether your work serves the body or the Supreme; this art transforms all activity into yoga.Listen — Srila Prabhupada Uvaca
Prabhupāda: Now Lord Śrī Kṛṣṇa is just trying to place Arjuna in the platform of working on pure consciousness. The... We have already discussed for so many days that we are not this dull body, but we are consciousness. Now, some way or other, we are in contact with this matter.
Therefore our freedom is checked. As spiritual being, we are free—free to act, free to have anything, pure, no contamination, no disease, no birth, no death, no old age, and besides that, we have got many, many other qualifications in our spiritual life. So unfortunately, because we are in contact with this matter, we are hampered in so many ways. This we should understand, and this is the opportunity. This human life is the only opportunity.
If we miss this opportunity, then it may be that in our next life we may not have again this nice, civilized human form of life according to our karma. But one thing is sure. You'll be glad to hear that once begun, this process of spiritual realization, one is guaranteed to have next life as human being. You'll find in the Bhagavad-gītā that śucīnāṃ śrīmatāṃ gehe yoga-bhraṣṭo 'bhijāyate [Bg 6.41]. [The unsuccessful yogī, after many, many years of enjoyment on the planets of the pious living entities, is born into a family of righteous people, or into a family of rich aristocracy.] You'll find in course of this discussion with Arjuna and Kṛṣṇa when Kṛṣṇa will describe about the yoga system, how to act it.
This is also yoga system, yoga-sthaḥ kuru karmāṇi. This is karma-yoga. This is karma-yoga. So any yoga, either karma-yoga or dhyāna-yoga or jñāna-yoga, any system of yoga, once begun in this life, that will continue. That will continue.
Yoga-sthaḥ kuru karmāṇi. The Bhāgavata says, Śrīmad-Bhāgavata says, tyaktvā sva-dharmaṃ caraṇāmbujaṃ harer bhajann apakvo 'tha patet tato yadi yatra kva vābhadram abhūd amuṣya kiṃ ko vārtha āptaḥ..., āptaḥ abhajatāṃ sva-dharmataḥ [SB 1.5.17] [One who has forsaken his material occupations to engage in the devotional service of the Lord may sometimes fall down while in an immature stage, yet there is no danger of his being unsuccessful. On the other hand, a nondevotee, though fully engaged in occupational duties, does not gain anything.] This is speech by Nārada to his disciple, Śrīla Vyāsadeva, that "You should try, people, to connect them in spiritual life, in conducting spiritual life. It doesn't matter even if he fails to complete the course; still, he's not loser.
Still, he's not loser. He..." The whole system of Vedic knowledge, especially the Kṛṣṇa philosophy... Kṛṣṇa philosophy—the whole philosophy. Vedic philosophy means Kṛṣṇa philosophy.
Vedaiś ca sarvair aham eva vedyam [Bg 15.15]. [I am seated in everyone's heart, and from Me come remembrance, knowledge and forgetfulness. By all the Vedas am I to be known; indeed I am the compiler of Vedānta, and I am the knower of the Vedas.] The all Vedic knowledge, all Vedic wisdom means to understand Kṛṣṇa philosophy. That's all. Nothing else.