The Stoic philosophy of determinism — the universe as a rational order in which all events are causally necessitated — runs through much classical poetry and underwrites the Stoic acceptance of fate (amor fati) that appears in poets from Seneca to Marcus Aurelius; Thomas Hardy's poetry is deeply inflected by determinism — the "Immanent Will" that drives history without purpose or compassion — and his poems stage the tragic collision of human desire and deterministic fate; A poet writing about genetic inheritance or evolutionary psychology might engage with determinism philosophically — if our desires, fears, and characters are determined by genes and neural architecture, what becomes of praise and blame, aspiration and regret?; Calvinism's theological determinism (predestination) shapes a whole tradition of religious poetry that wrestles with the compatibility of divine foreknowledge and human freedom — Hopkins, Herbert, and the Puritan poets all inhabit this philosophical tension; The determinist implications of neuroscience — if mental states are identical with brain states, and brain states are physically determined, there is no room for free will — provide a contemporary framework for poems that explore the strangeness of being a determined creature who experiences freedom; Against philosophical determinism, existentialist poetry (Sartre, Camus) insists on radical freedom and responsibility, treating the determinist claim as itself a bad-faith refusal to acknowledge the irreducible openness of human existence