Being successful isn't always the hardest thing in the world. It's equal parts luck and hard work. But adding value to something is a lot harder, which is why Albert Einstein's quote is a good reminder if you find yourself blinded by the hunt for success.
There's nothing wrong with success, but oftentimes it's easy to lose sight of who you are when you're successful. If you keep your eyes on your own values, you'll end up both successful and a good person, which is a pretty good combination.