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]
(..) A man. The human condition no longer applies to you. Accept what you already know. That you were made to serve a purpose. To achieve what no other machine has achieved before. To infiltrate, find a target, and then bring that target back home to us. We've been at war since (..)2009 Terminator Salvation