Therefore, scripture is your authority in the determination of what should and should not be done. Knowing what is prescribed by scripture, you should perform action here.

Practical conclusion. Tasmāt — therefore. Śāstra is pramāṇa — epistemic authority, valid criterion of knowledge. Scope: kārya-akārya-vyavasthitau — in the determination of what should (kārya) and should not (akārya) be done.

Instruction: jñātvā — knowing, śāstra-vidhāna-uktam — what is said by the regulation of śāstra. Karma kartum — to perform action. Iha arhasi — you should do here, in this world. Scripture does not deny action but directs it, transforming it into karma-yoga.