In today's Gospel, Jesus points out an issue that not only was in the mind of the people of his time but also of our time; the end of time.
So much thought and effort is expended on the discussion of the end of time as though knowing that would change people's perspective, attitude or actions. It doesn't.
All of us will come to the end of time, our death. This shouldn't be thought of as a morbid thought. Just think of it, when we die, the sun and moon will no longer rule our waking and sleeping (will we even need to sleep?)
Time is a factor of the transition between these two massive spheres floating in the universe. When we die, we depart this time constraint and enter a realm, we are told, where our mind, sight and hearing cannot even conceive.
We need to live our lives as though we were living in the last days, the end of time. We should not do something and then have regrets. It is much easier said than done, that is true. Everyone has this struggle, even those who were in Jesus' time.