Below are some quotes from Bernard of Clairvaux’s The Steps of Humility and Pride that I thought were profound:

“Humility is a virtue by which a man has a low opinion of himself…. You will never have real mercy for the failings of another until you know and realize that you have the same failings in your soul.”

[A man filled with pride] does not so much want to be better as to be seen to be better.  He is not so much concerned about leading a better life as appearing to others to do so … When a man thinks he is better than others will he not put himself before others? … He interferes without being asked.  He must rearrange everything, redo whatever has been done.  What he himself did not do or arrange is not rightly done or properly arranged.”