All these things were said and done in a vision from God; but it would take long, and would exceed the scope of this work, to treat of them exactly in detail. It is enough that we should know that, after it was said Abram believed in God, and it was counted to him for righteousness, he did not fail in faith in saying, "Lord God, whereby shall I know that I shall inherit it?" for the inheritance of that land was promised to him. Now he does not say, How shall I know, as if he did not yet believe; but he says, "Whereby shall I know," meaning that some sign might be given by which he might know the manner of those things which he had believed, just as it is not for lack of faith the Virgin Mary says, "How shall this be, seeing I know not a man?"[275] for she inquired as to the way in which that should take place which she was certain would come to pass. And when she asked this, she was told, "The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee."[276] Here also, in fine, a symbol was given, consisting of three animals, a heifer, a she-goat, and a ram, and two birds, a turtle-dove and pigeon, that he might know that the things which he had not doubted should come to pass were to happen in accordance with this symbol. Whether, therefore, the heifer was a sign that the people should be put under the law, the she-goat that the same people was to become sinful, the ram that they should reign (and these animals are said to be of three years old for this reason, that there are three remarkable divisions of time, from Adam to Noah, and from him to Abraham, and from him to David, who, on the rejection of Saul, was first established by the will of the Lord in the kingdom of the Israelite nation: in this third division, which extends from Abraham to David, that people grew up as if passing through the third age of life), or whether they had some other more suitable meaning, still I have no doubt whatever that spiritual things were prefigured by them as well as by the turtle-dove and pigeon. And it is said, "But the birds divided he not," because carnal men are divided among themselves, but the spiritual not at all, whether they seclude themselves from the busy conversation of men, like the turtle-dove, or dwell among them, like the pigeon; for both birds are simple and harmless, signifying that even in the Israelite people, to which that land was to be given, there would be individuals who were children of the promise, and heirs of the kingdom that is[277] to remain in eternal felicity. But the fowls coming down on the divided carcases represent nothing good, but the spirits of this air, seeking some food for themselves in the division of carnal men. But that Abraham sat down with them, signifies that even amid these divisions of the carnal, true believers shall persevere to the end. And that about the going down of the sun great fear fell upon Abraham and a horror of great darkness, signifies that about the end of