She knew from a young age that her sole 'purpose' (in life) was to be a writer. [=she knew that all she wanted (in life) was to be a writer]
We were happy to know that the money was being used 'for a good purpose'. [=for something useful, important, etc.]
There's little/no 'purpose' in restarting the process. [=there is little/no reason to start the process again]
(..) nothing else to live for, so... But as I lay there, waiting for it all to end... I heard her voice. She told me that it wasn't my time. That God had another purpose for me. You, too, have a purpose, Mia. To protect your family. So don't think you're crazy for trying to do that. (..)2014 Annabelle