I have sinned against my brother the ass.

The line is typically understood as an instance of Francis’s radical humility and his distinctive way of speaking about creation as “brother” and “sister.” Calling the donkey “my brother” extends moral regard beyond humans and reflects a penitential sensibility: even harshness toward a lowly working animal can be framed as a spiritual failing. In Franciscan spirituality, such language also functions as a critique of domination and pride—reminding the speaker that all creatures share dependence on God and deserve gentleness. The blunt self-accusation (“I have sinned”) dramatizes how seriously Francis takes compassion in everyday conduct.