4.27 Into the fire kindled by knowledge Krishna speaks

सर्वाणीन्द्रियकर्माणि प्राणकर्माणि चापरे
आत्मसंयमयोगाग्नौ जुह्वति ज्ञानदीपिते

sarvāṇīndriya-karmāṇi prāṇa-karmāṇi chāpare
ātma-sanyama-yogāgnau juhvati jñāna-dīpite

Others offer every function of the senses and of the breath into the fire of self-restraint, kindled by knowledge.

Explanation

Into the fire kindled by knowledge.

Every function of the senses and of the breath, offered into the fire of self-restraint — and the fire is lit by knowledge.

The chapter's images are converging. Knowledge is what makes the burning possible, which is why 4.37 can say it turns all action to ash.