Our Catholic homily for All Souls Day – Why does the Catholic Church believe in Purgatory?

Why does the Catholic Church believe in Purgatory?
A homily for All Souls Day (The Commemoration of the Faithful Departed)
by Fr Guy de Gaynesford   8 minutes
Readings:  Isaiah 25:6-9, Ps 26, Romans 5:5-11, Matthew 11:25-30 or Mark 5:33-39, 16:1-6, or Luke 7:11-17