HumilityIsKey to:
- ExtremeProgramming (see KentsTalkAtXpImmersionTwo).
- business success, according to BenFranklin.
- learning.
- sanctity. (Never trust a proud saint.)
- peace.
- self-knowledge.
- keeping friends
- contributing to Wiki (see WikiHumility)
- ....
Ah, I get it. Humility is part of the loop. If that part is broken, the learning cycle is broken and you're stuck. A key is useful for unlocking, and then you put it away until the next time. In that sense HumilityIsKey. e.g. An idiot is an example of the cycle broken, and a perpetual arrogance is mistakeable for idiocy.