Just like a computer virus, sin can spread in the church
A computer virus on the loose is a computer user's worst nightmare. A virus can destroy everything in a computer's memory. According to S&S Software International and writer James Coates, here is how a computer virus works. A computer virus is software, or a piece of programming code, whose purpose is to replicate.... Many viruses enter the computer via a floppy disk or are downloaded from another source. ... Once the computer is infected, the virus checks each time a program is opened to see if the program is clean. If it is, the virus copies itself onto the program. Because viruses need time to spread undetected, most will not affect the proper functioning of the computer right away.
But eventually their destructive power is felt as files are erased or corrupted. Just as a computer virus spreads through the files of a computer, so sin can spread in the church.
Holiness, Intervention, Spiritual sickness
I Cor. 5; Gal. 6:1
Contemporary Illustrations For Preachers, Teachers, & Writers
Editor Craig Brian Larson, Baker Books, p. 28.