Undetectable errors have infinite variety; detectable errors by definition are limited.
If nobody uses it, there's a reason.
In a bureaucratic system, useless work drives out useful work.
Merely because the group is in formation does not mean the group is on the right course.
Things should be as simple as possible -- but no simpler.
Once you have eliminated the impossible, whatever remains, however improbable, must be the truth.
What, me worry?
The effectiveness of a telephone conversation is in inverse proportion to the time spent on it.
One grunch, but the eggplant over there.
It's a rozzer to slip the dropsky in snide.