The Nyāya Sūtras is an ancient Indian Sanskrit text composed by Akṣapāda Gautama, also known as Aksapāda, and is the foundational text of the pracina or Old Nyaya school of Hindu philosophy.
The text contains 5 parts divided further into chapter and contains over 500 sutras.
Babaji is reading from Nyāya-darśanam with the Vātsyāyana's bhāsya, which includes the Hindi commentary by Dhundhiraj Shastri.
Krishna is the source of the Self. Naturally, the part has attraction to the source. Just like the water comes from the ocean, and once it reaches the ocean, it finds peace. We are part of Krishna. And we will find peace only when we are united with Him. Uniting can only happen through love. Otherwise, we are a lost child wandering here and there.