32 "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. 33 So you also, when you see all these things, know that it is near—at the doors! 34 Assuredly, I say to you, this generation will by no means pass away till all these things take place. 35 Heaven and earth will pass away, but My words will by no means pass away. Matthew 24:32-35
The fig tree was used as an analogy by Jesus.
When the fig tree's branch has already become tender and puts forth leaves, you know that summer is near. So also, when you see all the things about which Jesus spoke, you can know his coming (and the "Day of the Lord" wrath) is near--"at the door." Matthew 24:32-33
The cosmic signs at the end of great tribulation will mean His coming is "at the door":
29 "Immediately after the tribulation of those days the sun will be darkened, and the moon will not give its light; the stars will fall from heaven, and the powers of the heavens will be shaken. 30 Then the sign of the Son of Man will appear in heaven, and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of heaven with power and great glory. 31 And He will send His angels with a great sound of a trumpet, and they will gather together His elect from the four winds, from one end of heaven to the other.” Matthew 24:29-31
25 "And there will be signs in the sun, in the moon, and in the stars; and on the earth distress of nations, with perplexity, the sea and the waves roaring; 26 men's hearts failing them from fear and the expectation of those things which are coming on the earth, for the powers of the heavens will be shaken. 27 Then they will see the Son of Man coming in a cloud with power and great glory. 28 Now when these things begin to happen, look up and lift up your heads, because your redemption draws near." Luke 21:25-28
Also consider:
"12 I looked when He opened the sixth seal, and behold, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became like blood. 13 And the stars of heaven fell to the earth, as a fig tree drops its late figs when it is shaken by a mighty wind. 14 Then the sky receded as a scroll when it is rolled up, and every mountain and island was moved out of its place. 15 And the kings of the earth, the great men, the rich men, the commanders, the mighty men, every slave and every free man, hid themselves in the caves and in the rocks of the mountains, 16 and said to the mountains and rocks, "Fall on us and hide us from the face of Him who sits on the throne and from the wrath of the Lamb! 17 For the great day of His wrath has come, and who is able to stand?" Revelation 6:12-17
“9 Proclaim this among the nations: "Prepare for war! Wake up the mighty men, Let all the men of war draw near, Let them come up. 10 Beat your plowshares into swords And your pruning hooks into spears; Let the weak say, 'I am strong.'" 11 Assemble and come, all you nations, And gather together all around. Cause Your mighty ones to go down there, O LORD. 12 "Let the nations be wakened, and come up to the Valley of Jehoshaphat; For there I will sit to judge all the surrounding nations. 13 Put in the sickle, for the harvest is ripe. Come, go down; For the winepress is full, The vats overflow— For their wickedness is great." 14 Multitudes, multitudes in the valley of decision! For the day of the LORD is near in the valley of decision. 15 The sun and moon will grow dark, And the stars will diminish their brightness. 16 The LORD also will roar from Zion, And utter His voice from Jerusalem; The heavens and earth will shake; But the LORD will be a shelter for His people, And the strength of the children of Israel.” Joel 3:9-16
”1 Behold, the day of the LORD is coming, And your spoil will be divided in your midst. 2 For I will gather all the nations to battle against Jerusalem; The city shall be taken, The houses rifled, And the women ravished. Half of the city shall go into captivity, But the remnant of the people shall not be cut off from the city. 3 Then the LORD will go forth And fight against those nations, As He fights in the day of battle. 4 And in that day His feet will stand on the Mount of Olives, Which faces Jerusalem on the east. And the Mount of Olives shall be split in two, From east to west, Making a very large valley; Half of the mountain shall move toward the north And half of it toward the south. 5 Then you shall flee through My mountain valley, For the mountain valley shall reach to Azal. Yes, you shall flee As you fled from the earthquake In the days of Uzziah king of Judah. Thus the LORD my God will come, And all the saints with You.” Zechariah 14:1-5
“12 Then the sixth angel poured out his bowl on the great river Euphrates, and its water was dried up, so that the way of the kings from the east might be prepared. 13 And I saw three unclean spirits like frogs coming out of the mouth of the dragon, out of the mouth of the beast, and out of the mouth of the false prophet. 14 For they are spirits of demons, performing signs, which go out to the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty. 15 "Behold, I am coming as a thief. Blessed is he who watches, and keeps his garments, lest he walk naked and they see his shame." 16 And they gathered them together to the place called in Hebrew, Armageddon.” Revelation 16:12-16
Concerning “this generation” not passing away until all these things fulfilled:
I believe there is good reason to see this as a reference to the character of the nation of Israel, and not with reference to a time period, being the First Century.
Matt 24:34 (NKJV) "Assuredly, I say to you, this generation will by no means pass away till all these things take place.”
That generation of Israel according to her character would not pass away until all the things prophesied would take place. “This generation” is often identified as an evil and adulterous generation by Christ.
Matthew 12:39 But He answered and said to them, "An evil and adulterous generation seeks after a sign, and no sign will be given to it except the sign of the prophet Jonah.
Luke 11:29 And while the crowds were thickly gathered together, He began to say, "This is an evil generation . It seeks a sign, and no sign will be given to it except the sign of Jonah the prophet.
Matthew 11:16 "But to what shall I liken this generation ? It is like children sitting in the marketplaces and calling to their companion."
23:36-37a "Assuredly, I say to you, all these things will come upon this generation. " O Jerusalem, Jerusalem, the one who kills the prophets and stones those who are sent to her!"
Mark 8:38 "For whoever is ashamed of Me and My words in this adulterous and sinful generation , of him the Son of Man also will be ashamed when He comes in the glory of His Father with the holy angels."
Luke 16:8
(NKJV Strong's Bible) So the master commended the unjust steward because he had dealt shrewdly. For the sons of this world are more shrewd in their generation than the sons of light."
Peter said, And with many other words he testified and exhorted them, saying, "Be saved from this perverse generation . Acts 2:40
Psalm 78:8
"And not be like their fathers,
A stubborn and rebellious generation,
A generation that did not prepare its heart
And whose spirit was not faithful to God."
