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Bhagavad  -  gītā   As It Is
now absorbed in these literatures, must be transferred to the Vedic literatures. The great sages, therefore, have written so many Vedic literatures such as the  Purāṇas , etc. The  Purāṇas  are not imaginative; they are historical records. In the  Caitanya-caritāmṛita  there is the following verse:
māyā mugdha jiver nāhi svataḥ kṛṣṇa-jñān jivera kṛpāya kailā kṛṣṇa veda-purāṇa
((Cc. Madhya 20.122))
The forgetful living entities or conditioned souls have forgotten their relationship with the Supreme Lord, and they are engrossed in thinking of material activities. Just to transfer their thinking power to the spiritual sky, Kṛṣṇa has given a great number of Vedic literatures. First He divided the  Vedas  into four, then He explained them in the  Purāṇas , and for less capable people He wrote the  Mahābhārata . In the  Mahābhārata  there is given the  Bhagavad-gītā . Then all Vedic literature is summarized in the  Vedānta-sūtra , and for future guidance He gave a natural commentation on the  Vedānta-sūtra , called  Śrīmad-Bhāgavatam . We must always engage our minds in reading these Vedic literatures. Just as materialists engage their minds in reading newspapers, magazines and so many materialistic literatures, we must transfer our reading to these literatures which are given to us by Vyāsadeva; in that way it will be possible for us to remember the Supreme Lord at the time of death. That is the only way suggested by the Lord, and He guarantees the result: “There is no doubt.” (Bg. 8.7)
tasmāt sarveşu kāleşu mām anusmara yudhya ca mayy arpita-mano-buddhir mām evaişyasy asaṁśayaḥ
“Therefore, Arjuna, you should always think of Me, and at the same time you should continue your prescribed duty and fight. With your mind and activities always fixed on Me, and everything engaged in Me, you will attain to Me without any doubt.”
He does not advise Arjuna to simply remember Him and give up his occupation. No, the Lord never suggests anything impractical. In this material world, in order to maintain the body one has to work. Human society is divided, according to work, into four divisions of social order— brāhmaṇa ,  kṣatriya ,  vaiśya ,  śūdra . The  brāhmaṇa  class or intelligent class is working in one way, the  kṣatriya  or administrative class is working in another way, and the mercantile class and the laborers are all tending to their specific duties. In the human society, whether one is a laborer, merchant, warrior, administrator, or farmer, or even if one belongs to the highest class and is a literary man, a scientist or a theologian, he has to work in order to maintain his existence. The Lord therefore tells Arjuna that he need not give up his occupation, but while he is engaged in his