"I've always said as long as I can play, as long as I can do it to a good level, then I'll keep doing it because I still really enjoy playing," Butler tells the Chicago Sun-Times . "I'll know when the day comes I can't do this anymore, can't play to my usual standards. That's when I won't go out anymore. I won't do that to me self.

"But at the moment, I just love playing with the band. It probably will be the last time, will probably be the last tour. But I want to go out on a high. The band is playing really well at the moment."

Asked why he thinks the "13" tour will be Sabbath's final trek, Geezer says, "I don't know. I just got a feeling. It's getting tough, it really is. I can't lie about that. I'm old now. It really is tough going on every night. You wake up next day, all the pains you never had before.