This summary provides information about 3 individuals mentioned in the document:
1. Ernst Abbe (1840-1905) was a distinguished German physicist and inventor who was an atheist and social reformer. He implemented a generous profit-sharing scheme at the optical company Zeiss.
2. Andalusian ruler Abd ar-Rahman III (891-961) created a highly prosperous and cultured Islamic empire in Spain during a time when Europe was experiencing the Dark Ages. Historians note he defied the Quran and was clearly an atheist.
3. Philosopher Peter Abelard (1080-1142) was a brilliant teacher in 12th century Europe whose teachings were condemned