Augustine of Hippo
When you practice humility, you will be exalted; however, pride will cause you to be brought low. God easily identifies a weight that will cause you to bow down. This weight, a collection of your transgressions, will be placed upon you, leading you to submit.
Why was he humbled? Because he was raised up. If you practice humility, you will be honored; if you promote yourself, you will be brought low; for God is capable of finding a means to humble you. Let him grieve over it, so he may acquire something greater; let him observe the Sabbath, so he may deserve its blessings. What the Jews commemorated was merely a symbol. A symbol of what, you may ask? It points to that of which the one who claims, "I am ashamed and sorrowful unto death," is reminded. What does the phrase "unto death" signify? It refers to the very end. I have mourned throughout the day. This expression, throughout the day, signifies my entire existence. But how does he come to this realization? It is from the moment he begins to reflect on the Sabbath. As he recalls what he no longer possesses, can you blame him for mourning? For the entirety of my days, I have wandered in sorrow.