I have two, both of them from the Gospel of Matthew.
The first is Mt 5:1-12:
When Jesus saw the crowds, he went up the mountain, and after he had sat down, his disciples came to him.
He began to teach them, saying:
"Blessed are the poor in spirit,
for theirs is the kingdom of heaven.
Blessed are they who mourn,
for they will be comforted.
Blessed are the meek,
for they will inherit the land.
Blessed are they who hunger and thirst for righteousness,
for they will be satisfied.
Blessed are the merciful,
for they will be shown mercy.
Blessed are the clean of heart,
for they will see God.
Blessed are the peacemakers,
for they will be called children of God.
Blessed are they who are persecuted for the sake of righteousness,
for theirs is the kingdom of heaven.
Blessed are you when they insult you and persecute you and utter every kind of evil against you falsely because of me.
Rejoice and be glad,for your reward will be great in heaven." Thus they persecuted the prophets who were before you.
I consider the Beatitudes one of the most powerful passages in the Bible.
The second is Mt 21: 28:32:
What is your opinion? A man had two sons. He came to the first and said, ‘Son, go out and work in the vineyard today.’ He said in reply, ‘I will not,’ but afterwards he changed his mind and went. The man came to the other son and gave the same order. He said in reply, ‘Yes, sir,’ but did not go. Which of the two did his father’s will?" They answered, “The first.” Jesus said to them, "Amen, I say to you, tax collectors and prostitutes are entering the kingdom of God before you. When John came to you in the way of righteousness, you did not believe him; but tax collectors and prostitutes did. Yet even when you saw that, you did not later change your minds and believe him.
This was the Gospel reading at the first Mass I attended back when I was in college.
PF