Erlebnis is Dilthey's term for lived experience — the immediate, pre-reflective acquaintance with one's own mental life as it is lived from the inside. It is the bedrock of all human understanding: we understand other people and historical expressions because we ourselves have inner experience, and inner experience has a structure — it is always of something, it always involves feeling, valuation, and volition as well as cognition — that gives us a foothold for reconstructing the inner lives of others. Dilthey insists that Erlebnis is not the detached Cartesian cogito of rationalist philosophy but the full, temporal, feeling-laden, culturally situated inner life of a concrete historical being.
Inner experience presses outward into expression. Every text, painting, architectural style, legal code, religious ritual, and political institution is an Ausdruck — an objectification of human inner life in a form that can outlast the individual who produced it and be encountered by others across time and space. The objectifications of inner life form what Dilthey calls the objective spirit (in a more concrete sense than Hegel's): not a suprapersonal entity but the totality of cultural forms in which human beings have deposited their experience and through which they always already find themselves oriented. To be human is to be always already within an inherited world of expressions — a language, a tradition, an institutional structure — that shapes inner experience even as inner experience continues to produce new expressions.
Understanding (Verstehen) is the movement from expression back to the inner experience that produced it — a kind of re-experiencing (Nacherleben) or transposition into the inner life of another. This is not mere empathy or imaginative projection; it is a disciplined, method-governed process of interpretation that moves between the parts of an expression and the whole it constitutes, between the expression and the context of its production, between the strange and the familiar. Dilthey insists that understanding is always possible, even across great historical distances, because the structure of inner life — the basic forms of experience, expression, and meaning — is common to all human beings, even as its specific contents vary enormously across times and cultures.
The Erlebnis–Ausdruck–Verstehen triad is developed most fully in "The Formation of the Historical World in the Human Sciences" (1910), collected in Hermeneutics and the Study of History. Heidegger's concept of interpretation in Being and Time (1927) is a critical transformation of Dilthey's hermeneutics.
