A great building must begin with the unmeasurable, must go through measurable means when it is being designed and in the end must be unmeasurable.

The quote "A great building must begin with the unmeasurable, must go through measurable means when it is being designed and in the end must be unmeasurable" by Louis Kahn expresses his belief that architecture is both a technical and spiritual discipline. Kahn, one of the most revered architects of the 20th century, saw buildings not just as physical structures but as expressions of profound ideas, human values, and timeless truths. The "unmeasurable" at the beginning refers to the intangible inspiration behind a project—its purpose, emotion, or idea, which cannot be quantified but must guide the entire design process.

When Kahn mentions the need to pass through "measurable means," he acknowledges that turning inspiration into reality requires precision, planning, and technical execution. Architects must use mathematics, drawings, materials, and engineering to give form to the original concept. This is the practical, rational phase of architecture, where dreams are translated into blueprints and structures.

However, by ending again in the "unmeasurable," Kahn underscores that the final building—if it is truly great—must transcend its physical components. It should evoke a sense of wonder, beauty, or presence that defies simple explanation. This emotional and experiential impact, which can't be calculated or diagrammed, is what elevates architecture from mere construction to art. The building becomes greater than the sum of its parts, touching the human soul.

Ultimately, Kahn's quote is a poetic summary of his architectural philosophy, which seeks to balance function and feeling, logic and mystery. It’s a reminder that while architecture depends on measurable systems, its true success lies in creating spaces that move, inspire, and connect us to something greater than ourselves.