Moses had been chosen by God to lead the Jewish people. He is considered to be the greatest of all leaders, and the greatest of all prophets. Yet, in the face of his greatness, he displayed the ultimate example of humility. In fact, he is noted as the most humble man on the face of the earth (Num. 12:3).
Moses is a prime example that true leadership requires humility. Having humility means understanding your strengths and your weaknesses. It means not becoming arrogant in your strengths, and not undermining yourself in your weaknesses.
Being humble does not mean that you minimize your own worth. Thinking less of yourself is a false sense of humility. Being humble means recognizing that your gifts and talents are not of your own, but have been given to you by God. It means being thankful to Him for those gifts, and realizing that they have been given to you for a purpose: to improve the world.