Human beings have thought about Aananda and Happiness from the time of early evolution till present time. The reason being, it is connected with living life and Aananda cannot be separate from life. Some people of the society must have thought deeply about the ways to live life while keeping this Aananda (like waterfall in its original form) constantly. Many mainstream religions have thought about and found the ways, to develop the tools to develop the highest quality Bhavnas in the human beings. Furthermore they also thought about the changes that can happen in life by following these higher quality Bhavnas. Their aim was to find the ways to live life where the Aananda persists throughout the life without interruption. We need to think about experiencing such life with constant Aananda presently (with present Jiva-Nature). Our Jiva-Nature is guided by the Prakruti at present, This also leads to development of many kind of Rasas (happiness from fulfilling our worldly desires), but this happiness is not original or forever. Presently human mind must be yearning to develop true Aananda that is constant, natural and forever, without any interruption. Many methods of Sadhana and many transitional ways must have developed from such thoughts to experience such Aananda.
Pujya Shree Mota
Jivan Yog, Edition 1,
Part 2, Pages 70 - 71.