[N]ature repairs one thing from another and allows nothing to be born without the aid of another's death.
A falling drop at last will carve a stone.
Mother of Aeneas, pleasure of men and gods. -Aeneadum genetrix, hominum divomque voluptas
Nothing comes from nothing.
All life is a struggle in the dark.
Whenever anything changes and quits its proper limits, this change is at once the death of that which was before.