The Rose is without an explanation; She blooms, because She blooms.
About Angelus Silesius
Angelus Silesius, OFM (c. 1624 – 9 July 1677), born Johann Scheffler, was a German Catholic priest, physician, mystic and religious poet. Born and raised a Lutheran, he began to read the works of medieval mystics while studying in the Netherlands and became acquainted with the works of the German mystic Jacob Bohme through Bohme’s friend, Abraham von Franckenberg.