" Whitefield was the very first who seems thoroughly to have understood what Chalmers has called the aggressive system. He did not wait for souls to come to him, but he went after souls. He did not sit tamely by his fireside, mourning over the wickedness of the land. He went forth to beard the Devil in his high places. He attacked sin and wickedness face to face, and gave them no peace. He dived into holes and corners after sinners. He hunted up ignorance and vice, wherever it could be found. He showed that he thoroughly realized the nature of the ministerial office. Like a fisherman, he did not wait for the fish to come to him. Like a fisherman, he used every kind of means to catch souls. "

― J.C. Ryle , A Sketch of the Life and Labors of George Whitefield