The first Canto describes the birth of Savitri. But first earth must prepare herself to receive the Flame-child who brings with her a new epiphany. We see here a beautiful, vivid and symbolic description of the seasons, summer, rains, autumn and spring. Then the time arrived and earth itself begins to change. Savitri arrives but unlike the ordinary human birth, this is a conscious birth. She is the Divine Mother who has prepared the body and mind that will be fit and ready to receive her. She brings with her the new possibilities for earth and men. By assuming a human body she opens the door in matter itself for the new creation. She has brought with Her a New consciousness and by her very birth started infusing it into matter.
An essay in English by Alok Pandey
Their coming together opened a wide path for man that would eventually transform our earthly life into the Life Divine.
About Savitri | B1C1-10 The Response of Earth (p.5)