How to make yourself a good memory?

How to make yourself a good memory?

A lot of times I hear that……

“One day, you will be just a memory for some people. Do your best to be a good one.”

My question is: what should I do differently to be a good memory? I do a lot of good things to keep every one happy but the truth is people can never be happy.

Is it the human nature?

Just like its a human nature to be greedy, I think it is a human nature to be unhappy regardless what some one does for them.

What you think?