Saint Bonaventure, whose feast the Church celebrates on July 15th, begins his famous Mind's Journey to God, by invoking Blessed Francis, whose vision of the Six-Winged Seraph structures Bonaventure's reflection. Of Francis he says:

his preaching was the annunciation of peace both in the beginning and in the end, wishing for peace in every greeting, yearning for ecstatic peace in every moment of contemplation.

Here is the great painting of Francis in Ecstasy by Giovanni Bellini: