The most potent Durga Prayer for Navaratri "BHAVANYASHTAKAM (Eight stanzas of Bhavani Prayer)" written by Adi Shankarachary in Sanskrit translated in English:
5th Stanza नवरात्रि का पांचवां दिन , जय माँ स्कंदमाता
कुकर्मी कुसंगी कुबुद्धि कुदास:, कुलाचारहीन: कदाचारलीन:।
कुदृष्टि: कुवाक्यप्रबन्ध: सदाSहं, गतिस्त्वं गतिस्त्वं त्वमेका भवानि।
meaning
My mind is always engaged in worthless thoughts and actions.
My intellect has become dull, enslaved by old habits.
I am unable to behave honourably and my intentions are self-serving.
My speech is harsh and hurtful.
Save me, O Mother of the universe - You are my only savior, my eternal refuge.