Patristic Wisdom: Looking to the First Sunday in Advent

But in those days, after that tribulation, the sun will be darkened, and the moon will not give its light; the stars of heaven will fall, and the powers in the heavens will be shaken. Then they will see the Son of Man coming in the clouds with great power and glory. And then He will send His angels, and gather together His elect from the four winds, from the farthest part of earth to the farthest part of heaven. Now learn this parable from the fig tree: When its branch has already become tender, and puts forth leaves, you know that summer is near. So you also, when you see these things happening, know that it is near—at the doors! Assuredly, I say to you, this generation will by no means pass away till all these things take place. Heaven and earth will pass away, but My words will by no means pass away. But of that day and hour no one knows, not even the angels in heaven, nor the Son, but only the Father. Take heed, watch and pray; for you do not know when the time is. It is like a man going to a far country, who left his house and gave authority to his servants, and to each his work, and commanded the doorkeeper to watch. Watch therefore, for you do not know when the master of the house is coming—in the evening, at midnight, at the crowing of the rooster, or in the morning—lest, coming suddenly, he find you sleeping. And what I say to you, I say to all: Watch!” (Mark 13:24–37)

The whole passage of this Gospel Scripture, from the inquiry of the disciples down to the parable of the fig tree you will find the sense in its connection suit in every point the Son of man, so that it consistently ascribes to Him both the sorrows and the joys, and the catastrophes and the promises; nor can you separate them from Him in either respect. For as much, then, as there is but one Son of man whose advent is placed between the two issues of catastrophe and promise, it must needs follow that to that one Son of man belong both the judgments upon the nations, and the prayers of the saints. He who thus comes in midway so as to be common to both issues, will terminate one of them by inflicting judgment on the nations at His coming; and will at the same time commence the other by fulfilling the prayers of His saints: so that if you grant that the coming of the Son of man is of my Christ, then, when you ascribe to Him the infliction of the judgments which precede His appearance, you are compelled also to assign to Him the blessings which issue from the same. If you will have it that it is the coming of your Christ, then, when you ascribe to him the blessings which are to be the result of his advent, you are obliged to impute to him likewise the infliction of the evils which precede his appearance. For the evils which precede, and the blessings which immediately follow, the coming of the Son of man, are both alike indissolubly connected with that event.… Reflect, in short, on the picture presented in the parable: “Behold the fig-tree, and all the trees; when they produce their fruit, men know that summer is at hand. So likewise, when you see these things come to pass, know that the kingdom of God is very near.” Now, if the fructification of the common trees be an antecedent sign of the approach of summer, so in like manner do the great conflicts of the world indicate the arrival of that kingdom which they precede. But every sign is His, to whom belong the thing of which it is the sign; and to everything is appointed its sign by Him to whom the thing belongs. If, therefore, these tribulations are the signs of the kingdom, just as the maturity of the trees is of the summer, it follows that the kingdom is the Creator’s to whom are ascribed the tribulations which are the signs of the kingdom. Since the beneficent Deity had premised that these things must needs come to pass, although so terrible and dreadful, as they had been predicted by the law and the prophets, therefore He did not destroy the law and the prophets, when He affirmed that what had been foretold therein must be certainly fulfilled.

Tertullian, Against Marcion 4.39