It then became very clear to me that it was not the task of architecture to invent form.
I tried to understand what the task was.
I asked Peter Behrens, but he could not give me an answer.
He did not ask that question …
We searched in the quarries of ancient and medieval philosophy.
Since we knew that it was a question of truth, we tried to find out what the truth really was. We were very delighted to find an actual definition of truth by St. Thomas Aquinas:
“Adaequatio intellectus et rei” or as a modern philosopher expresses in the language of today: “Truth is the significance of fact”.
I never forgot this. It was very helpful, and has been a guiding light.
To find out what architecture really is took me fifty years – half a century.
Ludwig Mies van der Rohe, 1961"