“When silence takes possession of you; when far from the racket of the human highway the sacred fire flames up in the stillness; when peace, which is the tranquillity of order, puts order in your thoughts, feelings, and investigations, you are in the supreme disposition for learning; you can bring your materials together; you can create; you are definitely at your working point; it is not the moment to dwell on wretched trifles, to half live while time runs by, and to sell heaven for nothings.”