Acharya Prashant explains that human beings are fundamentally purposeless in their original state, which is their true nature. However, due to worldly influences and associations, they acquire numerous false purposes and intentions. Spirituality serves as the final stage where one adopts a single, ultimate purpose: to dissolve all other worldly purposes and return to one's original, purposeless state of being. He describes this as a three-step process: recognizing one's inherent purposelessness, acknowledging the current state of being filled with worldly motives, and finally using spiritual practice to transcend these motives and return to the source.