Actively, we are motivated by the never-ending desires of the self. We are compelled to pursue whatever the self imagines will satisfy its desires. We are convinced that satisfaction of desire is the source of true happiness. Yet the very nature of desire does not permit happiness. Like trying to quench one's thirst by drinking salt water, satisfying desire only stimulates the flow of desire. In the wake of fulfillment, desire once more stirs and reaches out. There is never lasting satisfaction, not even completion.
Dharma Publishing, Ways of Enlightenment
buddhism, desire, samsara, sutra