"Besides, he'd probably gotten himself invited to a Mennonite Bible study or prayer meeting somewhere. The Mennonites were known for seeking out the truths of God's Word and many of them ended up becoming missionaries.
At the time, Katie figured Dan had encountered some Bible-thumpers, that was all. But she hoped he'd be careful about his affiliation with outsiders. Especially Mennonites"
The Shunning by Beverly Lewis