He taught them a lesson. "Consider the fig tree and all the other trees. When their buds burst open, you see for yourselves and know that summer is now near; in the same way, when you see these things happening, know that the kingdom of God is near. Amen, I say to you, this generation will not pass away until all these things have taken place. Heaven and earth will pass away, but my words will not pass away. (Lk 21:29-33)
Trees are creation of God. They are to be considered (lessons have to be learned from them for life). Even their normal, natural growth teaches us lessons which are of great importance. They are signs at times of what is happening around. They indicate seasons. They also teach us that the nature is inter related. They have some common purpose.
Similarly what is happening around indicate that the kingdom is at hand. Events that happen in history are not without any purpose. They are not just disjoined actions. Events have some purpose and they indicate and point to something. Jesus who has come to establish the kingdom and who has come make the people realize that God is in the world says that the events lead up to this realization.
Jesus assures his listeners that whatever he has said would happen. Even heaven and earth will pass away. That is, this world will have its end. But the word of god will never have and end. It will continue to exist as it existed from the time before creation. Word of God lasts for ever.
