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]
(..) My life is my life, my choices. I didn't have to go to that hotel and wait for you, but I did. So, please, stop blaming yourself for me. Worry about your own purpose. Go... save the world, Cole. Ah, to hell with the world. Then what are we still doing here? For what? (..)2016 TvShow: 12 Monkeys Title: Lullaby Season: 2 Episode 8