Michael Grant said this quote
“ (...) But Gaia had absorbed the new information. I won't need to kill billions, Diana. When Nemesis is gone, there will be no other like me. Just me alone. I will grow and spread, one body and then another, and soon there will be so many of me that it will be impossible to eradicate me. Eventually all will be me, and I will be all.Won't that be boring? Diana asked. You'd be dating yourself. You'll have no one to discuss your evil plans with. (...) ”