Here are some examples:
* Of one's own volition: This means doing something willingly and without being forced.
* Through sheer volition: This suggests that something was achieved solely through willpower.
* By force of volition: This implies that someone used their will to overcome an obstacle.
* With a strong volition: This emphasizes the strength of someone's determination.
You can also use "in" or "with" depending on the specific context:
* In their own volition: This emphasizes the independence of the action.
* With great volition: This highlights the intensity of the will.
It's important to consider the intended meaning of your sentence when choosing the preposition.
Can you provide me with the sentence you're working with? I can then offer more specific guidance on the best preposition to use.