When my husband came to faith in Jesus, he got the idea that really good Christians didn’t poop. Or pee.
You have to know he was 18 at the time. He was a member in good standing of his high school’s audio-visual team, student council and chess club. I say this to highlight the fact that he was (and is) a very bright guy. He attended a Unitarian church for a while during his childhood, but had no first-hand experience with evangelicals to that point in his life. In fact, no one ever shared their faith with him. On his own during the fall of 1972, he read a tract, then read the gospel of Matthew in three days’ time. At some point during that process, he surrendered himself to his Savior.
When he found his way to church sometime after that, he drew some conclusions about what a good Christian was like. Apparently, he picked up the notion that Christians mastered their impurities in such a way that they no longer produced any. Growing in holiness meant fewer trips to the loo, apparently.