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Why did Kant say that intuitions without concepts are blind?

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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.

Immanuel Kant argued that "intuitions without concepts are blind" to emphasize that human knowledge requires the cooperation of two distinct mental faculties: sensibility and understanding.1

In Kant’s epistemology, these faculties function as follows:

Sensibility (Intuitions): This is the faculty through which we have an immediate acquaintance with particulars via the senses. It provides the raw data of experience, which Kant refers to as intuitions.1
Understanding (Concepts): This is the faculty of concepts, which allows us to organize, categorize, and describe those particulars.1

Kant maintained that these two must work together to produce knowledge. Intuitions alone are "blind" because, without concepts, we cannot identify or make sense of what we are perceiving; we would be unable to say what the particulars are. Conversely, he noted that concepts without intuitions are "empty," as they are merely abstract forms waiting to be applied to sensory data.1

Ultimately, for Kant, knowledge is not a passive reception of the world but a product of the mind actively bringing sensory content under the categories of the understanding.23