THE KEY TO NOT WASTING YOUR LIFE?

I've read this verse before, but re-read it again yesterday.  

Acts 13:36 (NIV), "...when David had served God's purpose in his own generation, he fell asleep..."

I don't want to cheapen everything that's packed away in this verse, but this is a good way to live and die...  

Wouldn't you LOVE God to say something like this about you?  

"He / She 'served MY purpose' in THEIR generation and then...LIGHTS OUT...  They're home. Good job.  Well done."