Benjamin Franklin

On Doing

If you would not be forgotten
as soon as you are dead and rotten,
either write things worth reading,
or do things worth the writing.

This is from Benjamin Franklin.

I was surprised to see the same sentiment in the memoirs of Jacques Casanova (Preface):

If you have not done things worthy to be written,
at least write things worthy to be read.

Casanova attributes this to an ancient author, speaking "in lecture-hall tones". The author is Pliny the Younger, writing to Tacitus (Letters, 6.16):

Equidem beatos puto, quibus deorum munere datum
est aut facere scribenda, aut scribere legenda;
beatissimos vero, quibus utrumque.

I don't read Latin. Can anyone supply a translation?
Thank in advance for your help.