Perhaps the responsorial psalm for the 13th Sunday in Ordinary Time captures the theme of the day's reading best. "I set the Lord ever before me; with Him at my right hand I shall not be disturbed."
Elijah does exactly this in the first reading. He has just undergone a conversion from self-pity, depression and despair. Jezebel was chasing him, and he longed for death. At the mountain on Horeb in a cave, Elijah met the Lord.
The readings for the 12th Sunday in Ordinary Time celebrate God's plan of redemption for His people. As usual, the prophetic passages from the Old Testament speak in a veiled yet hopeful language.
Zechariah quotes the Lord; "I will pour out on the house of David and on the inhabitants of Jerusalem a spirit of grace and petition." What does it mean "to pour out...a spirit of grace and petition"? Could this be a people's acknowledgment of their own sinfulness and a petition for mercy? Whatever God promises to do, by using the term "pour out," He promises to do so in lavish abundance.
On May 22, we celebrate the Feast of the Most Holy Trinity, and the readings shed light on this, the greatest of divine mysteries.
The Catechism of the Catholic Church (234) states: "The mystery of the Most Holy Trinity is the central mystery of Christian faith and life. It is the mystery of God in Himself. It is therefore the source of all the other mysteries of faith, the light that enlightens them. It is the most fundamental and essential teaching in the 'hierarchy of the truths of faith.'"
Jesus' gift of the Holy Spirit upon the apostles on Easter Sunday night was the beginning of a worldwide revolution to lead His faithful followers to eternal glory. On that night, Jesus unleashed upon the apostles, and eventually the whole world, the fruits of His passion, death and Resurrection. He unleashed God's awesome power of love to confront man's sinfulness and the forces of hell.