Perhaps nothing seems to be happening: you are doing alright where you are at, but the job is getting tedious. You might pick up an interesting assignment here or there to keep things interesting, but it's like adding honey to the same old oatmeal you eat every day: it's a little sweeter, but nothing really changes.
"It sounds quotable to say, 'great men seek out opportunities,' but what does that actually mean?" you might ask.
First of all, dare to dream. If you find yourself hating a coworker or lawyer in the field, ask yourself, "Am I envious?" Admit it if you are. It's okay. We all get envious from time to time, and the sooner you admit it to yourself, the sooner you can put yourself where he is. Don't envy. Become. The reason you hate that man or woman is because they are living your dream.
Dare to dream, and dream big. What is it you won't even let yourself hope for? Maybe it's time to let yourself fantasize. You could be working your dream job, and the only thing that is holding you back, the ultimate obstacle, is that you won't let yourself consider it possible.
This isn't about simple grandiosity -- "what if I were the President of the United States? What if I was God? What if I had a harem with 50 beautiful women?" Chances are, if you really got those things, you wouldn't even want them. That's the secret of the old advice "be careful what you wish for." What your heart really wants is something perhaps less shiny and incredible, but closer to your actual ability and proclivity.
It starts with a dream. Talk about your dreams. Bring those clouds in the sky down to earth. Perhaps taking a job that actually seems like a demotion or loss of power would bring you closer to your goal. That's okay: ultimately, you only have yourself to answer to, so hold fast to your dream and let it grow.
This is not escapism. There is a time to quit your job, and a time not to quit it, and once you get that rhythm down, you finally have found your own career path, the strange winding, incredible road that has never been travelled by anybody before. That's yours to travel.
Keep busy, keep happy, but take time to dream of how things could be better. Talk about it enthusiastically and others will believe in your dreams too, and will help contribute. Dreams cost nothing, so indulge yourself. You will be happier for it.