Revelation 6:2

A white horse, such as conquerors used to ride upon at a solemn triumph. This is commonly understood of our Saviour, Christ, who, by himself and his apostles, preachers, martyrs, and other saints, triumphed over all the adversaries of his Church. He had a bow in his hand, the doctrine of his gospel, piercing like an arrow the hearts of the hearers; and the crown given him, was a token of the victory of him who went forth conquering, that he might conquer. (Witham) --- He that sitteth on the white horse is Christ, going forth to subdue the world by his gospel. The other horses that follow represent the judgments and punishment, that were to fall on the enemies of Christ and his Church: the red horse signifies war; the black horse famine; and the pale horse (which has death for its rider) plagues or pestilence. (Challoner) --- White horse; viz. Jesus Christ, who came to subdue all nations to the faith. The bow signifies the gospel, and the word of God, those powerful arms, of which St. Paul so often speaks, as being so necessary for all who are engaged in bringing souls to the faith of Christ. The crown marks the sovereign power of Jesus Christ, and the assurance of conquest. (Cornelius; Bossuet; Du Pin)