Think about how many have lived, and how few are remembered. Even less are revered. Those that are, cannot be forgotten.
Memories fade with the passing years. So, it is important to let our actions speak for us. What is done cannot be undone.
Many are famous in their own time. But the moment passes and they fall into obscurity. Eventually, even the name loses its meaning.
Those who care, tend to be remembered. Years turn simple acts of goodness into qualifications for sainthood. Though the person is gone, their spirit lives on.
We are mortal, so immortality can only come through the impact we have made. Is the world better or worse for your being here? Make it better, and you will be that much harder to forget.