True humility is to recognize your value and others value while looking up. It is to see there is far greater than ourself into who we can become, who others can become, and how much more we can do and be.
To be humble is to serve others and be for their good as well as your own
To be humble is to have a realistic appreciation of your great strengths, but also of your weaknesses
Moses is an example of a man possessing true humility. He realizes his grandeur and importance as a leader of an entire nation, but also looked up to something greater than himself in G-d and realized how much more there is than who we are.