Super interesting!

The Catechism of the Catholic Church teaches regarding the topic of Purgatory as: 1030 All who die in God's grace and friendship, but still imperfectly purified, are indeed assured of their eternal salvation; but after death they undergo purification, so as to achieve the holiness necessary to enter the joy of heaven. Now we can also understand Purgatory from a natural point of view. If we bring to mind the time when we, as children were disciplined. It didn't feel good at the time, but gradually we got accustomed to it and certainly allowed us to remain grateful, relaxed and consistent to our duties in life. The Catholic understanding of freedom is the pursuit of Virtue. But that has to go through trials (fire). A Biblical overview: St. Matthew 11:28 because St. Matthew 16:25. You therefore have to (first, St. Matthew 6:27) Romans 8:13 and Colossians 3:5 (these are Galatians 5:19-21) because Apocalypse 3:3, Apocalypse 21:27, but by doing these St. John 10:10. And that's why St. Matthew 7:13-14. Might be useful to read also Corinthians 3:11-15, 2 Timothy 1:18, 1 Thessalonians 4:13-15.