BIMBAS: That is not dead, can eternal lie...
“That is not dead which can eternal lie,
And with strange aeons even death may die.”
H.P. Lovecraft
The quote essentially means the house and the inhabitants have the power to avert death and remain in stasis as long as they want or need to. In Lovecraft’s writing, it is in reference to the Elder Gods who can hibernate until the time is right to return to power. Thus, they never truly die, just as the couple will go on claiming lives forever.