Bhashya
या वै सा पृथिवी गायत्री इय वाव सा इदमेव ।तत्किम् ? यदिदमस्मिन्पुरुषे कार्यकारणसङ्घाते जीवति शरी-रम्, पार्थिवत्वाच्छरीरस्य ।कथं शरीरस्य गायत्रीत्वमिति,उच्यते-अस्मिन्हीमे प्राणा भूतशब्दवाच्या प्रति-ष्ठिता, अत पृथिवीवद्भूतशब्दान्वयप्राणप्रतिष्ठानात् शरीरंगायत्री, एतदेव यस्माच्छरीरं नातिशीयन्ते प्राणा ॥
In plain words
Whatever that earth is, the Gāyatrī is indeed that very thing. What does this refer to? It refers to the physical body of the living person, which is an aggregate of cause and effect, because the body is earthy in its nature. How can the body be called Gāyatrī? The answer is given: Within this body are established the vital breaths, which are designated by the word 'bhūta'. Therefore, just like the earth which supports the elements, because the breaths—which are termed bhūtas—are anchored in it, the body is Gāyatrī. And precisely for this reason the breaths do not exceed the body.
Close to the Sanskrit
Which indeed that earth is, the Gāyatrī this indeed is that. What is that? Whatever is in this person in the aggregate of effect and cause living the body, because of the body being earthy. How of the body is the Gāyatrī-ness? It is spoken: In this indeed these breaths designated by the word bhūta are established, therefore like the earth, from the establishment of breaths connected with the word bhūta the body is Gāyatrī, this very thing because the body the breaths do not exceed.