Intellectual setting
Gadamer developed philosophical hermeneutics by extending his teacher Heidegger's account of understanding as a basic mode of human existence into a full theory of textual and historical interpretation, and his 1981 Paris exchange with Derrida became a landmark confrontation between hermeneutic and deconstructive approaches to meaning.
Key ideas
Fusion of horizons
Gadamer argued that genuine understanding occurs through a "fusion of horizons" in which the interpreter's own historically situated perspective merges with that of the text or tradition being interpreted, rather than the interpreter achieving a neutral, view-from-nowhere objectivity.
The productivity of prejudice and tradition
Against the Enlightenment view that prejudice is simply an obstacle to be eliminated, Gadamer argued that inherited pre-judgments handed down by tradition are the necessary condition that first makes understanding of anything possible.
Legacy
Gadamer's "Truth and Method" is the founding text of modern philosophical hermeneutics and has shaped literary theory, legal and biblical interpretation, and theology, and his dialogue-based model of understanding remains a central reference point across the humanities.