I found debriefings were almost like confessing my sins to a priest

—except that this was done over a microphone, 

so the whole “congregation” heard my mea culpas, 

particularly when I had to say what all of us learned to say: “I don’t know.” 

Knowing what we didn’t know was how we kept people from getting killed.

(Gene Kranz, in Failure is not an Option: Mission Control From Mercury to Apollo 13 and Beyond)