Comment by Brian_K_White

You never heard the phrase "pay it forward?"

The gratitude is good and correct, but they did not do it for any kind of return from you. What they wanted most was for you to turn around and do the same thing for others.

Or not even that, just make good productive use of what they gave you. Merely having a job that does something in any way useful to society and doesn't actively harm others is good enough. But if you do go a bit further and be generous with your own time and consideration to others, even better.

If you feel this way to even write this post, then helping someone else with their problem probably comes naturally already and you don't even have to do anything you don't already naturally like to do and are probably already doing.