This prayer is the one which the Mother wrote after meeting Sri Aurobindo for the first time on the 29th March 1914.
March 30, 1914
HOW in the presence of those who are integrally Thy servitors, of those who have arrived at the perfect consciousness of Thy Presence, I perceive that I am still far, very far, from that which I would realise; and I know that what I conceive to be highest, noblest and purest is still dark and ignorant in comparison with that which I have to conceive. But this perception, far from being depressing, stimulates and strengthens my aspiration, my energy, my will to triumph over all obstacles so as to be at last identified with Thy law and Thy work.
Little by little the horizon becomes precise, the path becomes clear. And we advance to an ever greater certitude.
It matters not if there are hundreds of beings plunged in the densest ignorance. He whom we saw yesterday is on earth: His presence is enough to prove that a day will come when darkness shall be transformed into light, when Thy reign shall be indeed established upon earth.
O Lord, Divine Builder of this marvel, my heart overflows with joy and gratitude when I think of it, and my hope is boundless.
My adoration surpasses all words and my reverence is silent.
The text above is quoted from the Third Edition, 1954 (translation by Rishabhchand Samsukha)
This book is freely available at https://www.auro-ebooks.com/prayers-and-meditations-1954-edition/
About Savitri | B1C3-11 Towards Unity with God (pp.31-33)