Математиката

(1) "truths fascinating by their immovability, 
but horrifying by their lifelessness, 
like stones from barren mountains of disconsolate infinity" 

(2) "built out of the structural elements of our thinking"

L.E.J. Brouwer, у Mark van Atten, 
"Luitzen Egbertus Jan Brouwer", 2020 (link)