Well, 1/3 of the angelic beings (the fallen) will be there, according to the account of the fall, itself, and they are “eternal” beings. Also, God’s flame of righteousness requires no fuel, as evidenced by the burning bush not being singed or consumed by the fire. To digress, it reminds me of the weird debate from Return of the Jedi when the heroes were told they’d be cast into the Sarlacc and slowly digested over 1000 years. Some people took that to mean the Sarlacc had the ability to keep its prey alive for 1000 years as it performed the digestive process. In any event, as I said, I’ve spoken to a few Greek scholars on the subject and I’ve never had a satisfactory answer. This included not just the words used but the grammar around the words. So, for now, until I am satisfied otherwise, I’m sticking to my present position.