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]
(..) Ah, but your friends will remember you, that's the point. None of us were friends with Charlie Parker. That's the point. Travis and Dustin? They have plenty of friends and plenty of purpose. I'm sure they'll make great school board presidents someday. You catch on quick. Are you in Model UN? (..)2014 Whiplash