Sukadev recited during a Saturday evening Satsang the mantra Krishna Krishna Mahayogin which you'll find in Yoga Vidya Kirtan Songbook as number 604. "Krishna Krishna Mahayogin" is a Siddhi mantra Siddhi to get courage and confidence. This mantra is a mantra of confidence and courage: Krishna is called to take all Bhayas, all fears, to free themselves from foreign energy sources. Here the text is to sing along:
Krishna Krishna Mahayogin
Sarvam Me Vasham Anaya
For more background information (in German) please check out the entry in the online Kirtan Songbook.