Read carefully the order of verses, below.
Jesus has already returned in some form to bring His Kingdom–inside us (this was not His physical return). Heaven and earth were destroyed in 70 AD when Jerusalem and the temple were destroyed. New Jerusalem, or Heavenly Jerusalem, then appeared and JESUS RETURNED BRINGING HIS KINGDOM INSIDE US (OUR BODIES ARE THE TEMPLE TO INTERNALLY RECEIVE THE KINGDOM—NOW, HERE ON EARTH!!! THIS IS WHY HEAVEN AND EARTH HAD TO PASS AWAY. HE BROUGHT HIS KINGDOM BACK TO BE INSIDE US—HEAVEN ON EARTH. THIS IS THE KINGDOM OF GOD. HEAVEN WAS THEREAFTER AVAILABLE TO BE INSIDE US (AS WELL AS WHERE JESUS RESIDES): THE KINGDOM OF GOD INSIDE US WHERE WE WORSHIP JESUS INTERNALLY, NOT IN A BUILDING MADE BY HANDS.
27 For as the lightning cometh out of the east, and shineth even unto the west; so shall also the coming of the Son of man be.
30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
33 So likewise ye, when ye shall see all these things, know that it is near, even at the doors.
34 Verily I say unto you, This generation shall not pass, till all these things be fulfilled.
35 Heaven and earth shall pass away, but my words shall not pass away.
25 And the stars of heaven shall fall, and the powers that are in heaven shall be shaken.
26 And then shall they see the Son of man coming in the clouds with great power and glory.
30 Verily I say unto you, that this generation shall not pass, till all these things be done.
31 Heaven and earth shall pass away: but my words shall not pass away.
26 Men’s hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken.
27 And then shall they see the Son of man coming in a cloud with power and great glory.
28 And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh.
32 Verily I say unto you, This generation shall not pass away, till all be fulfilled.
33 Heaven and earth shall pass away: but my words shall not pass away.
1 And he said unto them, Verily I say unto you, That there be some of them that stand here, which shall not taste of death, till they have seen the kingdom of God come with power.
17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.
23 If ye continue in the faith grounded and settled, and be not moved away from the hope of the gospel, which ye have heard, and which was preached to every creature which is under heaven; whereof I Paul am made a minister;
26 Even the mystery which hath been hid from ages and from generations, but now is made manifest to his saints:
27 To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory: