अयमग्निः सर्वेषां भूतानां मध्वस्याग्नेःसर्वाणि भूतानि मधु यश्चायमस्मिन्नग्नौतेजोमयोऽमृतमयः पुरुषो यश्चायमध्या-त्मं वाङ्मयस्तेजोमयोऽमृतमयः पुरुषो-ऽयमेव स योऽयमात्मेदममृतमिदं ब्रह्मेदँसर्वम् ॥ ३ ॥
In plain words
This fire is honey to every living thing, and every living thing is honey to this fire. The shining, deathless being who lives in the fire, and the shining, deathless being who lives in your own power of speech -- they are the very same one. This is the Self. This is what never dies. This is Brahman. This is everything.
Close to the Sanskrit
This fire is honey for all beings, and all beings are honey for this fire. And the being who, in this fire, is made of light and made of immortality, and the being who, within the body, made of speech, made of light and made of immortality -- this indeed is that one; this is the Self; this is the immortal; this is Brahman; this is everything.