If you are immortal, better get in the habit of acting like it.

Or watch the things you gave your life to, broken,
And stoop and {build ’em up with worn-out tools:}

“Then he isn’t safe?” said Lucy.
“Safe?” said Mr. Beaver. “Don’t you hear what Mrs. Beaver tells you? Who said anything about safe? ’Course he isn’t safe. But he’s good.”
-- The Lion, the Witch & the Wardrobe, C.S. Lewis