I have made a few threads about this before, but am making another to refute the idea that the generation referred to in Mark 13 is referring to a future generation and not to the generation alive at Jesus' time. When I point out that Mark 13:30 states that Jesus' second coming was supposed to occur during the generation of his disciples, many Christians attempt to make the argument that "this generation" refers to the future generation when Jesus will return, rather than the generation alive at the time of Jesus. At first glance, it seems that this claim may be valid. However, a further study will reveal that it is not valid, and that the generation referred to in Mark 13:30 must have been the generation alive at the time of Jesus. To see this, consider the similarities of Matthew 10 and Mark 13, which both refer to apocalyptic events. I have highlighted the wording in red that is nearly exactly the same in both chapters, indicating that both of these chapters are referring to the second coming of Jesus and the end of the world. I have then highlighted in blue the specific prophecy (in both chapters) which states when this will occur.
Mark 13:
As Jesus was leaving the temple, one of his disciples said to him, “Look, Teacher! What massive stones! What magnificent buildings!”
2 “Do you see all these great buildings?” replied Jesus. “Not one stone here will be left on another; every one will be thrown down.”
3 As Jesus was sitting on the Mount of Olives opposite the temple, Peter, James, John and Andrew asked him privately, 4 “Tell us, when will these things happen? And what will be the sign that they are all about to be fulfilled?”
5 Jesus said to them: “Watch out that no one deceives you. 6 Many will come in my name, claiming, ‘I am he,’ and will deceive many. 7 When you hear of wars and rumors of wars, do not be alarmed. Such things must happen, but the end is still to come. 8 Nation will rise against nation, and kingdom against kingdom. There will be earthquakes in various places, and famines. These are the beginning of birth pains.
9 “You must be on your guard. You will be handed over to the local councils and flogged in the synagogues. On account of me you will stand before governors and kings as witnesses to them. 10 And the gospel must first be preached to all nations. 11 Whenever you are arrested and brought to trial, do not worry beforehand about what to say. Just say whatever is given you at the time, for it is not you speaking, but the Holy Spirit.
12 “Brother will betray brother to death, and a father his child. Children will rebel against their parents and have them put to death. 13 Everyone will hate you because of me, but the one who stands firm to the end will be saved.
14 “When you see ‘the abomination that causes desolation’a]">[a] standing where itb]">[b] does not belong—let the reader understand—then let those who are in Judea flee to the mountains. 15 Let no one on the housetop go down or enter the house to take anything out. 16 Let no one in the field go back to get their cloak. 17 How dreadful it will be in those days for pregnant women and nursing mothers! 18 Pray that this will not take place in winter, 19 because those will be days of distress unequaled from the beginning, when God created the world, until now—and never to be equaled again.
20 “If the Lord had not cut short those days, no one would survive. But for the sake of the elect, whom he has chosen, he has shortened them. 21 At that time if anyone says to you, ‘Look, here is the Messiah!’ or, ‘Look, there he is!’ do not believe it. 22 For false messiahs and false prophets will appear and perform signs and wonders to deceive, if possible, even the elect. 23 So be on your guard; I have told you everything ahead of time.
24 “But in those days, following that distress,
“‘the sun will be darkened,
and the moon will not give its light;
25 the stars will fall from the sky,
and the heavenly bodies will be shaken.’c]">[c]
26 “At that time people will see the Son of Man coming in clouds with great power and glory. 27 And he will send his angels and gather his elect from the four winds, from the ends of the earth to the ends of the heavens.
28 “Now learn this lesson from the fig tree: As soon as its twigs get tender and its leaves come out, you know that summer is near. 29 Even so, when you see these things happening, you know that itd]">[d] is near, right at the door. 30 Truly I tell you, this generation will certainly not pass away until all these things have happened. 31 Heaven and earth will pass away, but my words will never pass away.
Matthew 10:1-23:
Jesus called his twelve disciples to him and gave them authority to drive out impure spirits and to heal every disease and sickness.
2 These are the names of the twelve apostles: first, Simon (who is called Peter) and his brother Andrew; James son of Zebedee, and his brother John; 3 Philip and Bartholomew; Thomas and Matthew the tax collector; James son of Alphaeus, and Thaddaeus; 4 Simon the Zealot and Judas Iscariot, who betrayed him.
5 These twelve Jesus sent out with the following instructions: “Do not go among the Gentiles or enter any town of the Samaritans. 6 Go rather to the lost sheep of Israel. 7 As you go, proclaim this message: ‘The kingdom of heaven has come near.’ 8 Heal the sick, raise the dead, cleanse those who have leprosy,a]">[a] drive out demons. Freely you have received; freely give.
9 “Do not get any gold or silver or copper to take with you in your belts— 10 no bag for the journey or extra shirt or sandals or a staff, for the worker is worth his keep. 11 Whatever town or village you enter, search there for some worthy person and stay at their house until you leave. 12 As you enter the home, give it your greeting. 13 If the home is deserving, let your peace rest on it; if it is not, let your peace return to you. 14 If anyone will not welcome you or listen to your words, leave that home or town and shake the dust off your feet. 15 Truly I tell you, it will be more bearable for Sodom and Gomorrah on the day of judgment than for that town.
16 “I am sending you out like sheep among wolves. Therefore be as shrewd as snakes and as innocent as doves. 17 Be on your guard; you will be handed over to the local councils and be flogged in the synagogues. 18 On my account you will be brought before governors and kings as witnesses to them and to the Gentiles. 19 But when they arrest you, do not worry about what to say or how to say it. At that time you will be given what to say, 20 for it will not be you speaking, but the Spirit of your Father speaking through you.
21 “Brother will betray brother to death, and a father his child; children will rebel against their parents and have them put to death. 22 You will be hated by everyone because of me, but the one who stands firm to the end will be saved. 23 When you are persecuted in one place, flee to another. Truly I tell you, you will not finish going through the towns of Israel before the Son of Man comes.
So, we can see that this prophecy was clearly predicted to occur within the lifetimes of the disciples alive at Jesus' time. Both Matthew 10 and Mark 13 reference the second coming of Jesus (as indicated by the context) and both indicate that the second coming and final judgment was supposed to occur within the lifetime of Jesus' disciples. Any ambiguity about the phrase "this generation" in Mark 13 is cleared up in Matthew 10, indicating that this was clearly a failed prophecy. We also see this event referred to as the "day of judgment" in Matthew 10, providing even more confirming evidence that this was indeed a prophecy about the fictional "Judgment Day", which was supposed to have occurred nearly 2000 years ago.
