Luke 21

Luke also recorded the questions of His disciples -

"...Master, but when shall these things be? and what sign will there be when these things shall come to pass?" (New Testament | Luke 21:7)

After prophecying of the events to come, the Savior taught and -

"...spake to them a parable; Behold the fig tree, and all the trees;
30 When they now shoot forth, ye see and know of your own selves that summer is now nigh at hand.
31 So likewise ye, when ye see these things come to pass, know ye that the kingdom of God is nigh at hand." (New Testament | Luke 21:29 - 31)

Very similar to the prophecies during his mortal ministry, the Lord again prophesied of similar coming events is modern day (see D&C 88). At the conclusion of the most recent general conference of the Church, Elder Jeffrey R. Holland summarized -

"Brothers and sisters, in general conference we offer our testimonies in conjunction with other testimonies that will come, because one way or another God will have His voice heard. “I sent you out to testify and warn the people,” the Lord has said to His prophets. 15

“[And] after your testimony cometh the testimony of earthquakes, … of thunderings, … lightnings, and … tempests, and the voice of the waves of the sea heaving themselves beyond their bounds. …

“And angels shall … [cry] with a loud voice, sounding the trump of God.” 16

Now, these mortal angels who come to this pulpit have, each in his or her own way, sounded “the trump of God.” Every sermon given is always, by definition, both a testimony of love and a warning, even as nature herself will testify with love and a warning in the last days." (April 2011 General Conference,An Ensign to the Nations, Jeffrey R. Holland Of the Quorum of the Twelve Apostles)

These same warnings are given today by those we sustain as prophets, seers, and revelators.