The reading is from Mark 13:1-8, 24-37 (the gospel for Sunday 3/29):
As he came out of the temple, one of his disciples said to him, “Look, Teacher, what large stones and what large buildings!” 2 Then Jesus asked him, “Do you see these great buildings? Not one stone will be left here upon another; all will be thrown down.”
3 When he was sitting on the Mount of Olives opposite the temple, Peter, James, John, and Andrew asked him privately, 4 “Tell us, when will this be, and what will be the sign that all these things are about to be accomplished?” 5 Then Jesus began to say to them, “Beware that no one leads you astray. 6 Many will come in my name and say, ‘I am he!’ and they will lead many astray. 7 When you hear of wars and rumors of wars, do not be alarmed; this must take place, but the end is still to come. 8 For nation will rise against nation, and kingdom against kingdom; there will be earthquakes in various places; there will be famines. This is but the beginning of the birth pangs.
24 “But in those days, after that suffering,
the sun will be darkened,
and the moon will not give its light,
25 and the stars will be falling from heaven,
and the powers in the heavens will be shaken.
26 Then they will see ‘the Son of Man coming in clouds’ with great power and glory. 27 Then he will send out the angels, and gather his elect from the four winds, from the ends of the earth to the ends of heaven.
28 “From the fig tree learn its lesson: as soon as its branch becomes tender and puts forth its leaves, you know that summer is near. 29 So also, when you see these things taking place, you know that he[e] is near, at the very gates. 30 Truly I tell you, this generation will not pass away until all these things have taken place. 31 Heaven and earth will pass away, but my words will not pass away.
32 “But about that day or hour no one knows, neither the angels in heaven, nor the Son, but only the Father. 33 Beware, keep alert;[f] for you do not know when the time will come. 34 It is like a man going on a journey, when he leaves home and puts his slaves in charge, each with his work, and commands the doorkeeper to be on the watch. 35 Therefore, keep awake—for you do not know when the master of the house will come, in the evening, or at midnight, or at cockcrow, or at dawn, 36 or else he may find you asleep when he comes suddenly. 37 And what I say to you I say to all: Keep awake.”