When the mind is stilled in dreamless sleep, It brings rest and repose to the body. Just as birds fly to the tree for rest, All things in life find their rest in the Self.
- Prashna Upanishad
Sakka asked: "What is the cause of self-interest?" The Buddha answered: "It is perception of the world as one's object." "How does one overcome this perception of the world as apart from oneself?" "By acting for the increase of goodness and happiness. It is in this way that the world ceases to be one's object."
- Digha Nikaya