German engraved message in Munich.
I was recently in Munich walking near the meadow where they have the Oktoberfest. I saw an engraved message in the yard in front of a building that said, in German, something like "Put something in your head to work on so that you don't come up with so many stupid ideas." That was my translation of it, but I don't remember the German words, except "Kopf" and "bluete Ideen".
My questions are:
1) Does anyone recognize this message as a commonly known one?
2) If so, can you provide the original German?