It is a serious reflection for the evangelist, that wherever God's Spirit is at work, there Satan is sure to be busy. We must remember and ever be prepared for this. The enemy of Christ and the enemy of souls is always on the watch, always hovering about to see what he can do, either to hinder or corrupt the work of the gospel. This need not terrify or even discourage the workman; but it is well to bear it in mind and be watchful. Satan will leave no stone unturned to mar or hinder the blessed work of God's Spirit. He has proved himself the ceaseless, vigilant enemy of that work, from the days of Eden down to the present moment. Now, in tracing the history of Satan, we find him acting in two characters, namely, as a serpent, or as a lion--using craft or violence. He will try to deceive; and, if he cannot succeed, then he will use violence. Thus it is in this sixteenth chapter of the Acts. The apostle's heart had been cheered and refreshed by what we moderns should pronounce, "a beautiful case of conversion." Lydia's was a very real and decided case, in every respect. It was direct, positive, and unmistakable. She received Christ into her heart, and forthwith took Christian ground by submitting to the deeply significant ordinance of baptism. Nor was this all. She immediately opened her house to the Lord's messengers. Hers was no mere lip profession. It was not merely _saying_ she believed. She proved her faith in Christ, not only by going down under the water of baptism, but also by identifying herself and her household with the name and cause of that blessed One whom she had received into her heart by faith. All this was clear and satisfactory. But we must now look at something quite different. The serpent appears upon the scene in the person of THE DECEIVER. "It came to pass, as we went to prayer, a certain damsel possessed with a spirit of divination met us, which brought her masters much gain by soothsaying. The same followed Paul and us, and cried, saying, These men are the servants of the most high God, which show unto us the way of salvation. And this did she many days. But Paul, being grieved, turned and said to the spirit, I command thee in the name of Jesus Christ to come out of her. And he came out the same hour" (vers. 16-18).