In this video for that 31st Sunday in Ordinary Time, Dr. Brant Pitre explains the Sunday Mass readings where Zacchaeus climbs a tree in order to get a glimpse of Jesus.
Reading 1 - Wisdom 11:22 - 12:2
Psalm - Psalm 145:1-14
Reading 2 - 2 Thessalonians 1:11 - 2:2
Gospel - Luke 19:1-10