From Fr. Jude Botelho:
The first reading from the book of Sirach is a lesson on humility. While pride is the deadliest of the seven deadly sins, because it is founded on falsehood which destroys ourselves and those around us, humility is perhaps the most characteristic of Christian virtues. The humble person finds favour with God not because that favour is a reward for humility, but because humility, like faith, means abandoning self-assertion, all trust in oneself, and allowing God to act where we can do nothing.