Ananda is an analysis from vidarna sami, thousands of years ago. The self is the source of continuous happiness and maximum happiness. It comes all the way back to the self, even in a common sense analysis or atwetic analysis.
"I, the One, illumine this body and also reveal this universe. Therefore, mine is all this universe or indeed nothing is mine." Inspired by this verse from the Ashtavakra Gita, Swami Sarvapriyananda speaks on the nature of the Self.