The grand stair case can thus also be experienced as a "place of thought", as befits a universal library!
"Dare to know." – "Habe Mut, dich deines eigenen Verstandes zu bedienen."
This quote of Immanuel Kant from his work "Answering the question: What is enlightenment?" of 1784 is one example from the series. This admonition to remember to think for yourself for all the knowledge you have acquired still remains very up to date.