We can compare Bach’s chorales and arias to the rose windows of cathedrals, in which reflections continually change from brilliant major to somber minor. These rose windows are the soul of the cathedrals and they speak to the innermost part of human beings. So too do Bach’s chorales and arias. They constitute the romantic element of his immense output and they speak to us like no other romanticism. (Walter Rummel: Credo d’un artiste [1950])
Rather a beautiful quote by the Romantic French pianist Walter Rummel, who transcribed parts of JS Bach's Cantatas for piano