Complete Works of swami vivekanada, 5: 394

Think always, 'I am ever-pure, ever-knowing, and ever-free. How can I
do anything evil? Like ordinary people, can I ever be fooled with the
insignificant charms of lust and wealth?' Strengthen the mind with
such thoughts. This will surely bring real good.

Conversation with Priya Nath Sinha. Recorded in Bengali. Complete Works, 5: 394