What do you think drives you more? The desire for pleasure or for purpose. I think it takes both and to some extent they are substitutable. Yet I cannot help but see pleasure as the lesser cousin. In some sense, we are made for purpose while pleasure is made for us. And so when we live simply for a life of pleasure and purpose eludes us, we can be terribly empty.
Ultimately, we need both. Pleasure can help alleviate some pain along the way of purpose but when it ursurp the place of purpose in our lives, we are lost.