Rev Erlo Stegen preached (after the Golden Wedding Celebration) on Acts 19: 19 & 20:

"Many of them also which used curious arts brought their books together, and burned them before all men: and they counted the price of them, and found it fifty thousand pieces of silver. So mightily grew the word of God and prevailed."

The seven sons of Sceva had the right theology but had never dealt with sin and found Christ in their own lives. Thus, the demon possessed man overpowered them and caused them to flee "wounded and naked." When the believers in Ephesus heard about this incident they began to confess their own works of darkness. Many are preaching the right thing but never confess the hidden darkness in their own lives and thus are not victorious but are shown naked and wounded to the world.

Since the beginning of the revival in 1966 God has convicted people of things which they must part from and they have being bringing things to be burnt.

The things being burnt today fall into different categories:
Witchcraft fetishes (including talismans, good-luck charms, love-potions, New-Age books)
Things are stolen and can't be returned to their rightful owners;
Articles bought on the black market or from the profits of prostitution.

SEE PHOTOS AND VIDEO CLIPS OF FIRE SERVICE

More info on Ephesus (and more)
Take a virtual tour of Ephesus
Ephesus - archeology
The Occult - what does the Bible say about it?