The line is mātā bhūmiḥ putro'haṃ pṛthivyāḥ — “The earth is my mother; I am the son of the earth.” It comes from the Pṛthvī Sūkta, the hymn to the earth in the Atharva Veda, which is one of the longest hymns in the Vedic corpus and is devoted entirely to the earth.
Why the book places it here, just after this poem
- The poem's whole argument is that calling someone “somebody's mother” changes how you treat her. The hymn does exactly the same thing on a much larger scale: call the earth mother, and you can no longer treat it as a thing to be used up.
- The relationship named is two-way. A mother sustains; a child owes care in return. That is why this verse is quoted so often in discussions of the environment.
- The image is not unique to one tradition. Rivers are called Ganga Maiya, the country is Bharat Mata, and languages have their matru-bhasha. The idea that what nourishes you is a mother runs right through Indian usage.