John Wesley on Zechariah 1:8

A man - Christ Jesus in the shape of a man. Riding - In a posture of readiness. A red horse - This colour is a symbol of his coming to avenge himself on his enemies. The myrtle - trees - He posted himself in a convenient place to observe and be ready, among verdant, fragrant trees, emblems of the saints of God. In the bottom - This bottom or valley in which the myrtles grew, is an emblem of the church in a low, afflicted state. Behind him - Christ was, as becomes a captain, at the head, the rest, as his soldiers, are behind attending on him. Red horses - Horses and horsemen, and those are angels, ver.10. And the colour of these horses is red, probably denoting the bloody condition of states and kingdoms, by wars one against another when God punisheth his church, or when he avengeth himself. Speckled - Of a mixt colour; perhaps an emblem of affairs, not all dark, nor all light, such as those during the last seventy prophetic weeks. White - An emblem of the best days of the church.