A career can be meaningful or meaningless. It can be meaningful if you are making money doing something you feel it's important to do in the world: for example, nature conservation work. I am working on that, and in that realm I care about the work I do. But I also have a corporate job, where I'm just hired to do something for someone else. In that case, it's only about money and I just satisfy the job description without putting anything more into it. In that case I'm just using it to make enough money to support my future projects and I don't plan on staying here much longer.