We should not take either to karma, karma-kāṇḍa, fruitive activities for elevating to the heavenly planets; jñāna-kāṇḍa, for stopping birth and death and merge into the impersonal Brahman . . . that is jñāna-kāṇḍa.
So karma-kāṇḍa jñāna-kāṇḍa, Narottama dāsa Ṭhākura says everything is viṣa bhāṇḍa, the poison pot. Why poison pot? Karma-kāṇḍa amṛta yeba baliyā khāya. If we drink poison pot, thinking it as nectar, then the result will be that we have to accept another body and we have to be under the tribulation of material nature. And sometimes we get the body of the king of heaven, and sometimes we get the body of a hog for eating stool. This is going on. Nānā yoni brahman kare. We have to wander in different species of life, and we have to eat all abominable things. Tāra janma adhah-pāte yāya. (Prema-bhakti-candrikā)
So we should not spoil our life in that way, for creating another body. We should be very careful that we may not create another material body. And what is that safety position? Kṛṣṇa says, janma karma me divyaṁ yo jānāti tattvataḥ (BG 4.9). If you simply try to understand Kṛṣṇa, how Kṛṣṇa takes His birth, how He becomes the son of Devakī, son of Nanda Mahārāja, how He becomes the son of Yaśodā, these things if we study, if we try to understand Kṛṣṇa, if we don't accept Kṛṣṇa as ordinary man—avajānanti māṁ mūḍhā (BG 9.11)—then, in this way if we understand the science of Kṛṣṇa, yei kṛṣṇa-tattva-vettā sei guru haya (CC Madhya 8.128), if one understands the science of Kṛṣṇa, he is spiritual master.
Kibā vipra kibā śūdra nyāsī kene naya. It doesn't matter whether one is brāhmin or one is a śūdra or one is a sannyāsī or one is a gṛhastha. It doesn't matter. If he knows the science of Kṛṣṇa, yei kṛṣṇa-tattva-vettā sei guru haya, if he knows the science of Kṛṣṇa . . . yo jānāti tattvataḥ. Janma karma me divyaṁ yo jānāti tattvataḥ (BG 4.9). How that tattvataḥ, the truth can be understood, that is also explained by the Lord Himself: bhaktyā mām abhijānāti yāvān yaś cāsmi tattvataḥ (BG 18.55). You cannot understand in truth, you cannot understand Kṛṣṇa in truth by other process, karma, jñāna, yoga. No. Bhaktyā mām abhijānāti.
So we have to take to devotional service. Then we shall understand Kṛṣṇa. Kṛṣṇa will reveal. If you are engaged in Kṛṣṇa's service constantly, teṣāṁ satata-yuktānāṁ bhajataṁ prīti-pūrvakam (BG 10.10). If you have devoted, heart and soul, for service of Kṛṣṇa, then Kṛṣṇa is within your self. He'll give you intelligence. Buddhi-yogaṁ dadāmi tam. He'll give you intelligence. He'll purify your heart. He'll purify your position.