I found this quote by Virgil the other day, and I really like the sound of it. I believe that the majority of people need something to pull them through life. For some folks, it’s pleasures like “wine, women, and song.” For others, it’s something they aspire to and work hard to achieve; they may be dragged on by more than just a pleasure or another. But if they are following a vocation like writing, chances are they will enjoy a greater degree of pleasure or joy. All the time? No. Writers may tell you that sometimes they're not in the mood for it, and yet they feel compelled to plow on by an idea they develop, a character they're thinking about, or the prospect of getting paid for their writing. And yet, when they keep working at writing, and get better at it, every once in a while they will get a new spark of inspiration. That is one of the pleasures of writing. There are many other pleasures writers will mention: spending time exploring their ideas and their characters, creating something out of nothing that others will enjoy or benefit from, learning more about the craft of writing as they practice it. So yes, writing is not only about pleasure, but pleasure is a necessary ingredient in writing.
That said, I thought I'd continue with a quote from Ralph Waldo Emerson, which says, "The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well."