Day of rest. Went to church. The lesson in Sunday school was on obedience. The Sacrament meeting talks were on marriage. Our former bishop was on one of the speakers. He is a plumber, and likes to tell plumbing stories when he gets a chance. He told one about how a tree managed to sneak its roots through and into a sewer pipe which caused it to clog up. He compared that to how immorality can destroy marriage.Now, some may object to comparing marriage to a sewer pipe, but that is what he works with and thinks about all day, and the message is clear nevertheless - the dangers of subtle corruption. I have a lot of stories like that from software development. Pretty much anybody that works with things that have to work can tell you a similar story. I think there is a good lesson in those stories.