On (one's) own volition spoken language prepositional phrase
If one does something on their own volition, they do it because they want to.
He kept saying that he did it on his own volition, but I know someone told him to do it.
No one told me to give up cigarettes. I give it up on my volition.
It's not because I've done something wrong. I just left the company on my volition.
He'd gone to the police and confessed himself on his volition.
Be very nearly or inevitably lost, departed or deceased
He is in terminal cancer so I’m afraid he is as good as gone.