stranger : 他人

(…の)『見知らぬ人』《+『to』+『名』》 / 『よそから来た人』,外部の人,新しく来た人;外国人 / (…に)経験のない人,慣れていない人《+『to』+『名』》
Whereas schooling has a certain predictability, education quite often produces surprises. A chance conversation with stranger may lead a person to discover how little is known of other religions. People are engaged in education from infancy on.