出于本人自已的意志用英语怎么说？

出于本人自已的意志

by one’s own volition

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

own

n. 自己的事物，自己人；vt. 拥有，承认；vi. 承认；adj. 自己的，特有的；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。

volition

n. 意志，意愿，决定，选择；

例句
He felt as though he were in the grip of Fate and had no volition of his own.
他感觉自己好像被命运掌控，毫无自主选择的余地。