The 'father of Arab philosophy' said truth deserves acceptance no matter its source

Working in 9th-century Baghdad, al-Kindi became the first major philosopher to write in Arabic, translating and building on Greek thinkers like Aristotle for an Islamic audience. He insisted reason and revelation didn't have to conflict, and that philosophical truth deserved acceptance 'from whatever source it comes,' even from cultures outside his own.

— Al-Kindi, On First Philosophy (Fi al-Falsafa al-Ula) — 9th century AD