17:16-21 Athens was then famed for polite learning, philosophy, and the fine arts; but none are more childish and superstitious, more impious, or more credulous, than some persons, deemed eminent for learning and ability. It was wholly given to idolatry. The zealous advocate for the cause of Christ will be ready to plead for it in all companies, as occasion offers. Most of these learned men took no notice of Paul; but some, whose principles were the most directly contrary to Christianity, made remarks upon him. The apostle ever dwelt upon two points, which are indeed the principal doctrines of Christianity, Christ and a future state; Christ our way, and heaven our end. They looked on this as very different from the knowledge for many ages taught and professed at Athens; they desire to know more of it, but only because it was new and strange. They led him to the place where judges sat who inquired into such matters. They asked about Paul's doctrine, not because it was good, but because it was new. Great talkers are always busy-bodies. They spend their time in nothing else, and a very uncomfortable account they have to give of their time who thus spend it. Time is precious, and we are concerned to employ it well, because eternity depends upon it, but much is wasted in unprofitable conversation.

18-21. certain … of the Epicureans—a well-known school of atheistic materialists, who taught that pleasure was the chief end of human existence; a principle which the more rational interpreted in a refined sense, while the sensual explained it in its coarser meaning.

and of the Stoics—a celebrated school of severe and lofty pantheists, whose principle was that the universe was under the law of an iron necessity, the spirit of which was what is called the Deity: and that a passionless conformity of the human will to this law, unmoved by all external circumstances and changes, is the perfection of virtue. While therefore the Stoical was in itself superior to the Epicurean system, both were alike hostile to the Gospel. "The two enemies it has ever had to contend with are the two ruling principles of the Epicureans and Stoics—Pleasure and Pride" [Howson].

What will this babbler say?—The word, which means "a picker-up of seeds," bird-like, is applied to a gatherer and retailer of scraps of knowledge, a prater; a general term of contempt for any pretended teacher.

a setter forth of strange gods—"demons," but in the Greek (not Jewish) sense of "objects of worship."

because he preached Jesus and the resurrection—Not as if they thought he made these to be two divinities: the strange gods were Jehovah and the Risen Saviour, ordained to judge the world.