In a Zoom meeting with Bill and Sonia on 21st January 2023 Michael answers questions about the practice of self-investigation and self-surrender and other aspects of Bhagavan’s teachings, and explains that self-investigation is the culmination of the path of surrender.
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While explaining this, he discusses verses 24, 25 and 26 of Uḷḷadu Nāṟpadu. 
This episode can also be watched as a video, 2023-01-21 Self-investigation is the culmination of the path of surrender, and a more compressed audio copy in Opus format (which can be listened to in the VLC media player and some other apps) can be downloaded from here.