Catena Aurea by Aquinas
Some understand the day to be the time preceding the Passion, the night to be the Passion. In this sense, while it is day, would mean, before My Passion; Ye will not stumble before My Passion, because the Jews will not persecute you; but when the night, i. e. My Passion, cometh, then shall ye be beset with darkness and difficulties.
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Commentary on John
The Lord encourages them and says: "Just as one who sees the light does not stumble, but the one who walks at night stumbles, so too the one who does good and walks in deeds of light will not suffer any misfortune, while the one who does evil will suffer misfortune; therefore you have no need to fear, for we have done nothing deserving of death."
Or yet another way: "If he who sees this light does not stumble, how much more will he not stumble who abides with Me, provided he himself does not fall away from Me. Therefore you also, abiding with Me, the true Light, are afraid in vain."
Others understand "day" as the time before the suffering, and "night" as the time of the suffering. So, He says, as long as the "day" goes on, that is, while the time of suffering has not yet come, you will not stumble, for you will encounter neither persecution from the Jews nor any other unpleasantness. But when the "night" comes, that is, My suffering, then you, thrown into confusion, will gather in one small house out of fear of the Jews. From that time you will experience sorrows and afflictions, and much hostility and trouble. When I, the Light, am no longer living with you bodily, the night of sorrows will envelop you.
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Commentary on John
1489 But if any one walks in the night, that is, in the night of iniquities, he will easily find dangers. Concerning this night we read: "Those who sleep at night" (1 Thess 5:7). But such a one, he stumbles, that is, strikes against something, because the light, of righteousness, is not in him.
1490 A certain Greek, Theophylactus, explains this another way. Beginning at If any one walks in the day, he says that the "day" is the presence of Christ in the world, and the "night" is the time after Christ's passion. So the meaning is this: The Jews are not to be feared because as long as I am in the world it is not you, but I, who am in danger. Thus, when the Jews wanted to arrest Christ, he said to the crowd: "If you seek me, let these men go. This was to fulfill the word which he had spoken, 'Of those whom you gavest me I lost not one'" (18:8). But if any one walks in the night, that is, in the time after the passion, you should be afraid to go into Judea, because you will suffer persecution from the Jews: "Strike the shepherd and the sheep will be scattered."
1491 Augustine explains it another way, so that the "day" indicates Christ: "We must work the works of him who sent me, while it is day" (9:4), and "As long as I am in the world, I am the light of the world" (9:5). The twelve hours of this day are the twelve apostles: "Did I not choose you, the twelve?" (6:71). But what should we say of what follows: "And one of you is a devil?" Judas, therefore, was not an hour of this day because he gave no light. We should say that our Lord spoke these words [about the twelve] not in reference to Judas, but to his successor, who was Matthias. Thus, the sense of Are there not twelve hours in the day? is as though he were saying: You are the hours, I am the day. Just as the hours follow the day, so you must follow me. So, if I wish to go to Judea you ought not to precede me or change my will, but you should follow me. He said something similar to Peter: "Get behind me, Satan!" (Matt 16:23), i.e., do not go ahead of me, but follow me by imitating my will. If any one walks in the day is the same as saying: You should not fear any danger, because you are going with me who am the day. So just as one who walks in the day does not run into anything, that is, does not stumble, so also you who walk with me: "If God is for us, who is against us?" (Rom 8:31). And this is because he sees the light of this world in me. But if any one walks in the night, in the darkness of ignorance and sin, then he stumbles; and this is because the spiritual light is not in him, not because of a defect in the light, but because of his own rebellion: "There are those who rebel against the light" (Job 24:13).
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