The Second Coming of Jesus

Matthew 24:32-35
32 “Now learn a lesson from the fig tree. When its branches bud and its leaves begin to sprout, you know that summer is near. 33 In the same way, when you see all these things, you can know his return is very near, right at the door. 34 I tell you the truth, this generation will not pass from the scene until all these things take place. 35 Heaven and earth will disappear, but my words will never disappear.

" A generation is a period of thirty to one hundred years. (In 24:34) it refers to the particular generation that will see the specific signs of the prior context. This same generation, living at that time during the great tribulation, will also witness the second coming of Christ."
-Matthew: Thy Kingdom Come, John F. Walvoord

The principle of preparation is relevant for Christians, regardless of their beliefs about the end times.

Matthew 24:36-39
36 “However, no one knows the day or hour when these things will happen, not even the angels in heaven or the Son himself. Only the Father knows. 39 When the Son of Man returns, it will be like it was in Noah’s day. 38 In those days before the flood, the people were enjoying banquets and parties and weddings right up to the time Noah entered his boat. 39 People didn’t realize what was going to happen until the flood came and swept them all away. That is the way it will be when the Son of Man comes.

The specific signs before the return of Jesus warn of impending judgment and gracious protection.

Matthew 24:40-41
40 “Two men will be working together in the field; one will be taken, the other left. 41 Two women will be grinding flour at the mill; one will be taken, the other left.

John 19:16
Then Pilate turned Jesus over to them to be crucified. So they took Jesus away.

Matthew 24:42-44
42 “So you, too, must keep watch! For you don’t know what day your Lord is coming. 43 Understand this: If a homeowner knew exactly when a burglar was coming, he would keep watch and not permit his house to be broken into. 44 You also must be ready all the time, for the Son of Man will come when least expected.

1 Thessalonians 5:2
For you know quite well that the day of the Lord’s return will come unexpectedly, like a thief in the night.

Matthew 24:45-51
45 “A faithful, sensible servant is one to whom the master can give the responsibility of managing his other household servants and feeding them. 46 If the master returns and finds that the servant has done a good job, there will be a reward. 47 I tell you the truth, the master will put that servant in charge of all he owns. 48 But what if the servant is evil and thinks, ‘My master won’t be back for a while,’ 49 and he begins beating the other servants, partying, and getting drunk? 50 The master will return unannounced and unexpected, 51 and he will cut the servant to pieces and assign him a place with the hypocrites. In that place there will be weeping and gnashing of teeth.

Hebrews 9:27-28
27 And just as each person is destined to die once and after that comes judgment, 28 so also Christ was offered once for all time as a sacrifice to take away the sins of many people. He will come again, not to deal with our sins, but to bring salvation to all who are eagerly waiting for him.