नष्टो मोहः स्मृतिर्लब्धा त्वत्प्रसादान्मयाच्युत। स्थितोऽस्मि गतसन्देहः करिष्ये वचनं तव ॥

naṣhṭo mohaḥ smṛitir labdhā tvat-prasādān mayāchyuta sthito ‘smi gata-sandehaḥ kariṣhye vachanaṁ tava

Destroyed is my delusion. I have gained knowledge through Thy grace, O Immutable one. I am firm, my doubts have fled away. I will do according to Thy word.

In plain words: Arjuna answers that his confusion is gone and he understands now, thanks to Krishna's kindness. He feels steady, his doubts are gone, and he will do what Krishna says.