become an end in itself

Of a pursuit or activity, to come to be performed for its own sake rather than for some greater goal or purpose. Studying foreign languages can become an end in itself for many students who love the challenge and sense of accomplishment it brings. I originally took this course to improve my résumé, but I loved the material so much that it became an end in itself. I have no interest in publishing my work—the joy I get from being creative has become an end in itself.