At every type of birth, life is shaken to its foundations, not by sickness nor by some external menace but by its most important function. It is just in this circumstance that its association with death becomes clearest.
Otto argues that birth and death are structurally inseparable in the great moments of life’s transformation, explaining why deities of fertility and death so frequently merge into a single divine figure.
, Dionysus Myth and Cult (1965), 1965thesis