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Why did Kant say that concepts without intuitions are empty?

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Marble bust of Aristotle with a beard and draped robe, showing detailed facial features and wavy hair, set against a dark background. — metaphysics Detail of a Roman copy (2nd century bce) of a Greek alabaster portrait bust of Aristotle (c. 325 bce); in the collection of the Museo Nazionale Romano, Rome.

In his metaphysics, Immanuel Kant argued that human knowledge requires the cooperation of two distinct faculties: sensibility, which provides intuitions, and the understanding, which provides concepts.1

Kant maintained that concepts without intuitions are empty because they are merely formal structures—"forms waiting to be brought to bear on particulars"—that lack any content or connection to reality. For knowledge to occur, the mind must have an acquaintance with particulars, which is supplied exclusively through the senses via intuition. Without this sensory grounding, concepts cannot refer to anything in the world, rendering them incapable of producing knowledge.1

Conversely, Kant noted that intuitions without concepts are "blind," as one cannot make sense of or identify particulars without the general descriptions provided by the understanding. Thus, for Kant, true knowledge is only possible when the mind synthesizes these two elements, applying conceptual categories to the data of sensory experience.12