Words of Louis I. Kahn about an aspect of architecture. These words are true for the domain of design too.
… an aspect you must learn
is that architecture really does not exist.
Only a work of architecture exist.
Architecture does exist in the mind.
A man who does a work of architecture
does it as an offering to the spirit of architecture…
A spirit which knows no style,
knows no techniques, no method.
It just waits for that which presents itself.
There is architecture, and it is the embodiment
of the unmeasurable.
Can you measure the Parthenon?
No. This is sheer murder.
Can you measure the Pantheon,
that wonderful building which satisfies the institution of man?
Louis Kahn: Conversations with Students, page 32