“Thinking means: letting-lie-before-us and so taking-to-heart also: beings in being.”
(Martin Heidegger, What Is Thinking?)
This formulation immediately displaces the ordinary understanding of thinking as an act of representation, calculation, or problem-solving. To think, Heidegger suggests, is first to let something lie before us—to allow beings to present themselves without being immediately subsumed under explanatory schemes or instrumental aims. This “letting-lie-before-us” is neither passivity nor indifference; it names a disciplined restraint, a suspension of domination, through which what is encountered may appear as it is. Thinking thus begins not with assertion, but with openness.
Yet Heidegger does not stop at this gesture of letting. The phrase “and so taking-to-heart” marks a decisive transition. What is allowed to lie before us is not merely observed; it is taken up into care, concern, and responsibility. Thinking binds us to what appears. It is an engagement that accepts being addressed by what is, rather than standing over it as a sovereign subject. Already here, thinking shows itself to be a mode of involvement rather than a detached mental operation.
The decisive weight of the definition, however, lies in the final words: “beings in being.” This is not a redundant clarification but the ontological core of the sentence. Heidegger does not say that thinking concerns beings as objects, nor Being as an abstract principle, but beings in their being—beings as they stand within the openness of Being itself. To encounter a being in its being is to encounter it as more than a discrete entity: it is to encounter its mode of presence, its way of relating, and its place within a shared ontological horizon.
From this perspective, thinking is intrinsically relational. A being encountered in its being is never isolated; it refers beyond itself to other beings and to the clearing of Being in which such relations are possible at all. Thinking, therefore, does not merely let beings appear; it allows the relations among beings, grounded in Being, to come into view. These relations are not externally imposed connections but structural articulations that belong to beings as beings.
It is here that abstraction assumes a new and often misunderstood role. Ontological thinking does not reject abstraction; it rejects abstraction that cuts beings off from their being. Properly understood, abstraction is a drawing-out of relational structures that are already operative within beings as they appear in Being. To think is to trace these relations—not over beings, but via Being itself. Being is not a highest concept above beings; it is the medium through which beings are intelligible to one another.
Thus, the initial gesture of letting-lie-before-us finds its fulfillment not in quiet contemplation, but in a disciplined articulation of relations. Thinking lets beings be, takes them to heart, and through this care allows their mutual belonging in Being to be abstracted and held open. In this sense, thinking is neither passive receptivity nor technical mastery, but an ontological mediation: a way of staying with beings in their being such that their relations—to Being and to one another—can come into view without distortion.
Seen this way, Heidegger’s definition does not retreat from rigor; it redefines rigor at its root. Thinking is the patient, responsible tracing of beings in being—and of the relational world that unfolds only when we allow Being itself to guide the search.

