" This private association of mine is a precious possession I would not willingly give up. But the fact that two sensual experiences leap up every time I think, ‘spring is coming’—that fact is my own personal affair. It can be communicated, certainly, as I have communicated it to you just now. But it cannot be transmitted. I can make you understand my association, but I cannot so affect a single one of you that my private association will become a valid symbol for you in your turn, a mechanism which infallibly reacts on call and always follows the same course. "

― Hermann Hesse , The Glass Bead Game