Medieval Christians saw Muslims as stubbornly resistant to conversion

Evidence

The obduracy of Muslims, who throughout the ages have proved almost unconvertible, was several times stressed, and both theory and missionary practice recognised it. — Norman Daniel, Islam and the West, 742

Categorization

• XREF: Interesting inversion of a modern trope: here it is Christians who complain that Muslims resist conversion fully — speaks to the vault’s concern with the persistence-and-threat construction of Islam.