King James Version
If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself.English Standard Version
If anyone's will is to do God's will, he will know whether the teaching is from God or whether I am speaking on my own authority.Catholic Public Domain Version
If anyone has chosen to do his will, then he will realize, about the doctrine, whether it is from God, or whether I am speaking from myself