Second Coming of Christ  (The End of the World)

Our Lord repeatedly foretold his return "on the clouds of Heaven". It is expressly and repeatedly stated in the New Testament that Christ gave no revelation of the time of his second coming. (From A Catholic Dictionary, 1951)
 

References in Scripture:

• "But of that day or hour no man knoweth, neither the angels in heaven, nor the Son, but the Father. Take ye heed, watch and pray. For ye know not when the time is. Watch ye therefore, (for you know not when the lord of the house cometh: at even, or at midnight, or at the cockcrowing, or in the morning,) Lest coming on a sudden, he find you sleeping" Mark 13:32-33,34-35
• "For this we say unto you in the word of the Lord, that we who are alive, who remain unto the coming of the Lord, shall not prevent them who have slept. For the Lord himself shall come down from heaven with commandment, and with the voice of an archangel, and with the trumpet of God: and the dead who are in Christ, shall rise first. Then we who are alive, who are left, shall be taken up together with them in the clouds to meet Christ, into the air, and so shall we be always with the Lord" 1 Thes 4:14-16
• "And it shall come to pass, in the last days, (saith the Lord,) I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams. And upon my servants indeed, and upon my handmaids will I pour out in those days of my spirit, and they shall prophesy. And I will shew wonders in the heaven above, and signs on the earth beneath: blood and fire, and vapor of smoke. The sun shall be turned into darkness, and the moon into blood, before the great and manifest day of the Lord come." Acts 2:17-20
• "For yourselves know perfectly, that the day of the Lord shall so come, as a thief in the night. For when they shall say, peace and security; then shall sudden destruction come upon them, as the pains upon her that is with child, and they shall not escape. But you, brethren, are not in darkness, that that day should overtake you as a thief" 1 Thes 5:2-4
• "He that soweth the good seed, is the Son of man. And the field, is the world. And the good seed are the children of the kingdom. And the cockle, are the children of the wicked one. And the enemy that sowed them, is the devil. But the harvest is the end of the world. And the reapers are the angels. Even as cockle therefore is gathered up, and burnt with fire: so shall it be at the end of the world. The Son of man shall send his angels, and they shall gather out of his kingdom all scandals, and them that work iniquity. And shall cast them into the furnace of fire: there shall be weeping and gnashing of teeth. Then shall the just shine as the sun, in the kingdom of their Father. He that hath ears to hear, let him hear." Matthew 13:37-43
• "Know also this, that, in the last days, shall come dangerous times. Men shall be lovers of themselves, covetous, haughty, proud, blasphemers, disobedient to parents, ungrateful, wicked, Without affection, without peace, slanderers, incontinent, unmerciful, without kindness, Traitors, stubborn, puffed up, and lovers of pleasures more than of God: Having an appearance indeed of godliness, but denying the power thereof. Now these avoid." 2 Timothy 3:1-5
• "Knowing this first, that in the last days there shall come deceitful scoffers, walking after their own lusts, Saying: Where is his promise or his coming? for since the time that the fathers slept, all things continue as they were from the beginning of the creation. For this they are wilfully ignorant of, that the heavens were before, and the earth out of water, and through water, consisting by the word of God. But the heavens and the earth which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of the ungodly men. The Lord delayeth not his promise, as some imagine, but dealeth patiently for your sake, not willing that any should perish, but that all should return to penance. But the day of the Lord shall come as a thief, in which the heavens shall pass away with great violence, and the elements shall be melted with heat, and the earth and the works which are in it, shall be burnt up." 2 Peter 3:3-5,7,9-10
• "For as lightning cometh out of the east, and appeareth even into the west: so shall the coming of the Son of man be. Wheresoever the body shall be, there shall the eagles also be gathered together. And immediately after the tribulation of those days, the sun shall be darkened and the moon shall not give her light, and the stars shall fall from heaven, and the powers of heaven shall be moved: And then shall appear the sign of the Son of man in heaven: and then shall all tribes of the earth mourn: and they shall see the Son of man coming in the clouds of heaven with much power and majesty. And he shall send his angels with a trumpet, and a great voice: and they shall gather together his elect from the four winds, from the farthest parts of the heavens to the utmost bounds of them." Matthew 24:27-31
• "And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, by reason of the confusion of the roaring of the sea and of the waves; Men withering away for fear, and expectation of what shall come upon the whole world. For the powers of heaven shall be moved; And then they shall see the Son of man coming in a cloud, with great power and majesty. But when these things begin to come to pass, look up, and lift up your heads, because your redemption is at hand." Luke 21:25-28
• "And when he had said these things, while they looked on, he was raised up: and a cloud received him out of their sight. And while they were beholding him going up to heaven, behold two men stood by them in white garments. Who also said: Ye men of Galilee, why stand you looking up to heaven? This Jesus who is taken up from you into heaven, shall so come, as you have seen him going into heaven." Acts 1:9-11
• "I say to you, that he will quickly revenge them. But yet the Son of man, when he cometh, shall he find, think you, faith on earth?" Luke 18:8
   

Church Teaching:

• "The Sacred Scriptures inform us that there are two comings of the Son of God: the one when He assumed human flesh for our salvation in the womb of a virgin; the other when He shall come at the end of the world to judge all mankind. This latter coming is called in Scripture the day of the Lord. The day of the Lord, says the Apostle, shall come, as a thief in the night; and our Lord Himself says: Of that day and hour no one knoweth." Catechism of Council of Trent, The Creed, Article VII
• "The Scriptures mention certain events which are to take place before the final judgment. These predictions were not intended to serve as indications of the exact time of the judgment, for that day and hour are known only to the Father, and will come when least expected. They were meant to foreshadow the last judgment and to keep the end of the world present to the minds of Christians, without, however, exciting useless curiosity and vain fears. Theologians usually enumerate the following nine events as signs of the last judgment:
  
  1. General Preaching of the Christian Religion
  2. Conversion of the Jews
  3. Return of Enoch and Elijah
  4. A Great Apostasy
  5. The Reign of Antichrist
  6. Extraordinary Perturbations of Nature
  7. The Universal Conflagration
  8. The Trumpet of Resurrection
  9. "The Sign of the Son of Man Appearing in the Heavens."
  1917 Catholic Encyclopedia, General Judgment, Signs to Precede the General Judgment

Summary

Scripture is clear, Christ will come again to judge the living and the dead, and no one knows the day or time!