A saint is a person who practices the keystone human virtue of humility. Humility in the face of wealth and plenty, humility in the face of hatred and violence, humility in the face of strength, humility in the face of your own genius or lack of it, humility in the face of another's humility, humility in the face of love and beauty, humility in the face of pain and death. Saints are driven to humbling themselves before all the splendor and horror of the world because they perceive there to be something divine in it pulsing and alive beneath the hard dead surface of material things -- greater and purer than they are.
I once heard the pianist, Arthur Rubinstein, being interviewed. At one point he was asked to share his experience of playing Chopin's Nocturnes. He said in effect, "I do not know what it is. But over and over again I have had the experience of sitting in a crowded concert hall playing the Nocturnes and I can feel everyone in the room waiting for the next note." In this moment of waiting, all present find their contemplative community in their oneness with one another in the boundless mystery that enraptures them.