One of the ways a dog shows he's submitting to another dog is to expose his belly. He is saying to the other dog that he is not a threat and aggression isn't necessary on the part of the other dog. This is how the handshake between men began. To extend the hand you'd use to hold your sword would show that you mean no harm. But humility is more than just an outward show of submission. It is a "modest view of oneself" that says to God that He is greater, but more importantly, I believe, allows me to call upon Him for all my needs.
