Seeing people evolve around you gives you a fulfilling. Even more if you were there for them giving advice, sharing ideas and links, lending a book, explaining principles, answering to HOWs and WHYs, making up a step-by-step plan to help them better organize themselves.
If they’re unemployed, maybe you help them get a job. If they’re coworkers, you push them to ask more from themselves regarding the big picture of the project, how to search for help, how to detach sometimes from their mindset and try something new.
And very important, you make them ask themselves how others solved different situations and why they applied some principles. You help them identify needs and track down bugs.