on (one's) own volition

Of one's own choice. No one told me to leave. I left early on my own volition. You failed this class on your own volition—don't try to blame it on me!

Common Names:

Name	Pronounced	Usage
Hameed	-	Arabic
Alecto	-	Greek Mythology (Latinized)
Masha	-	Russian
Arthur	AHR-thər (English), ar-TUYR (French), AHR-toor (German), AHR-tur (Dutch)	English, French, German, Dutch, Norwegian, Danish, Swedish, Welsh Mythology, Arthurian Romance
Kelia	-	English (Rare)
Ashburnham	['æʃbɜ:nəm]