For the same reason in the prophet Zechariah we also read the foretold number of the evangelists, reported by the prophet like this: “I saw,” he said, “four chariots going out of two mountains ,and these mountains, he said, were mountains of bronze. In the first chariot were red horses, and in the second chariot were black horsed, and in the third chariot were white horses, and in the fourth chariot were different and dappled horses. And I said to the angel who was speaking to me: What are these, lord? Responding he said to me: Do you not know what these are? And I said: No, lord. And he told me: These are the four winds of the sky that stand with God before the whole earth.” And so this is the number of the chariots.

In fact the following rationale, promulgated by prophetic reason, teaches us to perceive a type of the gospel truth: we notice that the gospels have also been clearly designated in these chariots. He declared that the four horses are described in four parts, as we best recall, because each of the gospels must be understood in the four and the four in each. Although the preaching of the evangelists would rightly seem to be in four portions, they still are undividedly of one mind for the unity of the faith. In fact, we know that the gospels were clearly prefigured in these chariots, because the prophet asked the angel speaking to him about what these were and he was told this: “These are the four winds of the sky that stand with God before all the earth,” which he reported by God’s command to have circled all the earth. And if we have not considered the saying about these winds (which blow through the lands and generate waves or brew up storms), it is simple enough to understand that, when they have been described in the prophets desiring only the divine and eternal heavenly things, the Lord deservedly adds more: “These are the ones that circle the earth; they soften my fury.” As we perceptively have recognized, the divine wrath, which was over people’s sins, cannot otherwise be appeased except through the gospel’s preaching, which runs throughout the globe and gives both the remission of sins and salvation to the human race. — Prologue, Section 9.