"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;  men’s hearts failing them from fear and the expectation of those things which are coming on the earth, for the powers of heaven will be shaken.  Then they will see the Son of Man coming in a cloud with power and great glory.  Now when these things begin to happen, look up and lift up your heads, because your redemption draws near."  

Then He spoke to them a parable: “Look at the fig tree, and all the trees.  When they are already budding, you see and know for yourselves that summer is now near.  So you also, when you see these things happening, know that the kingdom of God is near.  Assuredly, I say to you, this generation will by no means pass away till all things take place.  Heaven and earth will pass away, but My words will by no means pass away.  But take heed to yourselves, lest your hearts be weighed down with carousing, drunkenness, and cares of this life, and that Day come on you unexpectedly.  For it will come as a snare on all those who dwell on the face of the whole earth.  Watch therefore, and pray always that you may be counted worthy to escape all these things that will come to pass, and to stand before the Son of Man."

Lk 21:25-36   (NKJV)