It is always an advantage for the advocate of any particular cause to know the tactics of his adversary. He will be the better prepared for the onset, and repel the attack the more easily. Forewarned of danger, he will intrench himself in a position from which it will be impossible to dislodge him. The apostle Paul possest this advantage in a very eminent degree. In the earlier years of his apostleship, the Jew and the Greek were the antagonists with whom he had to contend. Having been himself a member of the straitest sect of the Jews, he knew full well the antipathy with which they regarded anything which set itself by its simplicity in contrast with their magnificent ritual; and he knew also the haughty scorn with which they turned away from what they deemed the unworthy accessories of the Nazarene. And, well read as he was in classic literature, and acquainted with all the habits and tendencies of the Grecian mind, he could readily understand how the restraints of the gospel would be deemed impertinent by the voluptuous Corinthian, and how the philosophic Athenian would brand its teachers mad. And yet, rejoicing in the experimental acquaintance with the gospel, he says, for his standing-point of advantage: "We preach Christ crucified, to the Jews a stumbling-block and to the Greeks foolishness, but to them that are called, the power of God and the wisdom of God." And in the words of the text, addressing some of those very Corinthians upon whom the gospel had exerted its power, he seems to accept the stigma and vindicate the glorious madness: "For whether we be beside ourselves, it is to God: or whether we be sober it is for your cause. For the love of Christ constraineth us; because we thus judge, that if one died for all, then were all dead; and that he died for all, that they who live should not henceforth live unto themselves, but unto him who died for them, and rose again." The great purpose of the apostle in these words is to impress upon us the fact that the cause of Christ in the world, sanctioned by the weight of so many obligations, fraught with the destinies of so many millions, should be furthered by every legitimate means; that for it, if necessary, should be employed the soberest wisdom; and for it, if necessary, the most impassioned zeal. He vindicates the use of zeal in the cause of Christ by the three following considerations: First, from the condition of the world; secondly, from the obligations of the Church; and, thirdly, from the master-motive of the Savior's constraining love. To illustrate and enforce this apostolic argument, as not inappropriate to the object which has called us together, will be our business for a few brief moments to-night.