"For from within, out of men's hearts, come evil thoughts, sexual immorality, theft, murder, adultery, greed, malice, deceit, lewdness, envy, slander, arrogance and folly." Mark 7:21, 22
Christian! the remembrance of what you are by nature, should keep you humble.
I love this quote because I know how much I notice these things in my own heart and mind.
I also need all the help I can get when seeking to be humble.