The most potent Durga Prayer for Navaratri "BHAVANYASHTAKAM (Eight stanzas of Bhavani Prayer)" written by Adi Shankaracharya in Sanskrit translated in English:
8 th Day of Navratri ( अष्टमी प्रातः लोकल ) Last Stanza
अनाथो दरिद्रो जरा-रोगयुक्तो, महाक्षीणदीन: सदा जाड्यवक्त्र:।
विपत्तौ प्रविष्ट: प्रणष्ट: सदाSहं, गतिस्त्वं गतिस्त्वं त्वमेका भवानि।
meaning
O Mother, I feel like an orphan on this Earth,
powerless and without inner wealth,
deluded by ignorance and unable to see the light of truth.
O Mother of the universe - You are my only savior, my eternal refuge.