There was a novice who learned much at the Master's feet,
but felt something to be missing. After meditating on his
doubts for some time, he found the courage to approach
Master Foo about his problem.
"Master Foo," he asked "why do Unix users not employ
antivirus programs? And defragmentors? And malware
cleaners?"
Master Foo smiled, and said "When your house is well
constructed, there is no need to add pillars to keep the
roof in place."
The novice replied "Would it not be better to use these
things anyway, just to be certain?"
Master Foo reached for a nearby ball of string, and began
wrapping it around the novice's feet.
"What are you doing?" the novice asked in surprise.
