Jñāneśvarī (commentary on the Bhagavadgītā) 4.104

4.104

āṇi heṃ karma mī karīna |
athavā ādarileṃ siddhī neīna |
yeṇeṃ saṃkalpeṃhī jayāceṃ mana |
viṭāḷenā ||

and, 'I will do this action' / or 'I will bring to completion what has begun'— / by such willful intention his mind / is never tainted.