Wolfgang Wackernagel and others have called Suso a "Minnesinger in prose and in the spiritual order" or a "Minnesinger of the Love of God" both for his use of images and themes from secular, courtly, romantic poetry and for his rich musical vocabulary. The mutual love of God and man which is his principal theme gives warmth and color to his style. He used the full and flexible Alemannic idiom with rare skill, and contributed much to the formation of good German prose, especially by giving new shades of meaning to words employed to describe inner sensations.