Humbleness comes from working with others. When you work with others, you realize the need to be patient, to give space and time to others to develop their own understanding of goodness and bravery. If you are frantic and try to push your understanding onto others, then nothing happens except further chaos. Knowing that, you become extremely humble and patient in working with others.
“The Shambhala Lineage,” in Shambhala: The Sacred Path of the Warrior, page 178.