Aude Sapere, Eternal Security is another word for "once saved always saved". once you are saved you can't be lost, I know better and maybe you do to, but that is what foundation Bill's religion is based on, and John 10 27-29.
John 10:27 My sheep hear my voice, and I know them, and they follow me:
John 10:28 and I give unto them eternal life; and they shall never perish, and no one shall snatch them out of my hand.
John 10:29 My Father, who hath given them unto me, is greater than all; and no one is able to snatch them out of the Father’s hand.