Now, here the Supreme Personality of Godhead, Kṛṣṇa, is personally speaking Bhagavad-gītā. Is it not Veda? That is Veda. That is real Veda. Sarva-upaniṣade. In the Gītā-māhātmya it is said, "This is the essence of all Veda." This is Vedānta. Simply by studying Bhagavad-gītā, one becomes a learned science in the science of God.
So śāstra-kahe. Śāstra-kahe. And what (is) that śāstra? The essence of all śāstra, the essence of all scripture, asks you to do—the śāstra says, the Lord says—sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66): "Give up everything. Just surrender unto Me." This is the most confidential part of knowledge. So "give up everything" means there are different processes, different processes: ritualistic processes, different religious processes, philosophical processes, meditation, so many. "Give up all. Simply surrender to Kṛṣṇa."
So Lord Caitanya is stressing on that point that, aiche śāstra kahe—karma, jñāna, yoga tyaji'. Karma. Karma means general activities on moral principle. That is called karma. Karma means, real karma means that you have to live, so you have to work. So work in such a way that you may not be entangled. Just like honest businessman, he works; he works according to the law.