Acts 16:19

The hope of their gains was gone - It was this that troubled and enraged them. Instead of regarding the act as proof of divine power, they were intent only on their profits. Their indignation furnishes a remarkable illustration of the fixedness with which people will regard wealth; of the fact that the love of it will blind them to all the truths of religion, and all the proofs of the power and presence of God; and of the fact that any interposition of divine power that destroys their hopes of gain, fills them with wrath, and hatred, and complaining. Many a man has been opposed to God and his gospel because, if religion should be extensively prevalent, his hopes of gain would be gone. Many a slave-dealer, and many a trafficker in ardent spirits, and many a man engaged in other unlawful modes of gain, has been unwilling to abandon his employments simply because his hopes of gain would be destroyed. No small part of the opposition to the gospel arises from the fact that, if embraced, it would strike at so much of the dishonorable employments of people, and make them honest and conscientious.

The market-place - The court or forum. The market-place was a place of concourse, and the courts were often held in or near those places.

The rulers - The term used here refers commonly to civil magistrates.