He left of his own volition.

To live in love for action and to let live in the understanding of another person's volition is the fundamental maxim of free human beings.

Mary had gone to the police of her own volition.

These are both called "future volitional" and include the intent of the subject.

I very much hope that I did not pressure him, but that he came with us of his own volition.

There are situations where you return to secular life of your own volition, and there are situations where the religious sect forces you to return to secular life.

Despite my parents' preference, I have decided to attend an out-of-state college on my own volition.