If dying after a billion years doesn't sound sad to you, it's because you lack a thousand-year-old brain that can make trillion-year plans.
If only the converse were true...
"...if you lack a thousand-year-old brain that can make trillion-year plans, dying after a billion years doesn't sound sad to you"?
I'm confused as to what you're trying to say. Are you saying that dying after a billion years sounds sad to you?
Here's the new thread for posting quotes, with the usual rules: