Simple:
* She acted entirely of her own volition.
* The decision to leave was made without any outside influence, solely through his own volition.
More complex:
* The prisoner's confession was made under duress, not of his own volition.
* Despite the pressure from his family, he followed his own volition and pursued a career in art.
* The robot, although complex, was not capable of acting with volition.
Figurative:
* The waves crashed against the shore with a volition of their own. (Personifying the waves)
Remember, "volition" refers to the power of acting or deciding on your own.