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]
(..) It's night?! - Closed. Great. - And I will betcha you don't have a warrant to get in. - Darn it. It's a bummer. - You wasted the day on purpose. Ma'am, I have a fake badge. I would never impede your pretend investigation. It's not a pretend investigation! Look, see? See him? This otter is missing. (..)2016 Zootopia
(..) Nick? Oh, Nick. Nighthowlers aren't wolves, they're toxic flowers. I think someone is targetting predators on purpose and making them go savage. Wow. Isn't that interesting? Wait, please don't.. I know you'll never forgive me. And I don't blame you. I wouldn't forgive me either. (..)2016 Zootopia
(..) It's such a pretty boat. Ship. What's your name? Smith. Or Smithy, if you like. What's your purpose in Port Royal, Mr.Smith? Yeah. And no lies. Well, then, I confess. It is my intention to (..)2003 Pirates of the Caribbean: The Curse of the Black Pearl