A Stable Mind
"Arjuna is eager to know the characteristics of a man who has a stable mind. Such a person, Krishna tells him, will have no desires at all. Since he is content within, having realized the Self, he is entirely free from desires. The consciousness of the Atman (true inner self) and abandonment of desires are simultaneous experiences. The various qualities of a Sthitaprajna (स्थितप्रज्ञ - a stable-minded person) are described by Krishna. He will not be affected by adversity and will have no fear or anger. He will take things as they come, and will not have any likes and dislikes. He will neither hug the world nor hate it.
The man of stable mind will have perfect control of the senses. The senses are powerful and draw the mind outwards. One should therefore turn one’s gaze within and realize God who resides in the heart. The Yogi (योगी - he who listens), having achieved a stable mind, remains steadfast even though all sense-objects come to him. He is unmoved and lives a life of eternal peace.
Krishna concludes that the eternal Brahmic state frees one from delusion forever. Even at the end of life, when one departs from this body, one does not lose consciousness of one’s identity with Brahman (ब्रह्म - Absolute Reality."
~ Bhagavad Gita
It seems as though this
https://en.wikipedia.org/wiki/Bhagavad_Gita Bhagavad Gita may be an interesting read as well. I'm confused if it is a part of a larger collections, though.