Even Busch and his friends were embarrassed .
The publisher Eduard Daelen , also an artist and writer , echoed Busch 's anti-Catholic bias , putting him on equal footing with Leonardo da Vinci , Peter Paul Rubens and Gottfried Wilhelm Leibniz , and uncritically quoting correspondences .
Even Busch and Busch 's friends were embarrassed .
The publisher Eduard Daelen , also an artist and writer , echoed Busch 's anti-Catholic bias , putting him on equal footing with Leonardo da Vinci , Peter Paul Rubens and Gottfried Wilhelm Leibniz , and uncritically quoting correspondences .