Please could someone tell me where this is from;
Wer viel einst zu verkunden hat,
schweigt viel in sich hinein:
Wer einst den Blitz zu zunden hat,
Muss lange - Wolke sein.
He who has much to proclaim one day, stays silently much immersed within himself: he who has to kindle the lightning one day, must for a long time - be a cloud.