It is God`s word that says -
"And in them, (Israel at that time) the prophecy of Isaiah is fulfilled, which says,
`Hearing you will hear and shall not understand, and seeing you will see and not perceive; for the heart of this people has grown dull. Their ears are hard of hearing, and their eyes they have closed lest they should see with their eyes and hear with their ears, lest they should understand with their heart and turn, so that I should heal them.` (Matt. 13: 14 & 15)
Jesus is the sower, (Matt. 13: 37) and He is speaking to the people of Israel concerning His rulership, (of heaven) upon them. The nation of Israel only had 7 more years to fulfil the chastisement of Dan. 9: 24. They could have received their king and thus the rule (kingdom) of heaven would have come upon them.
However they mostly were dull of hearing, hard hearted and of their father the devil. Thus the Lord is speaking SPECIFICALLY to that generation in Israel who should have received their king and His rule, the rule, (kingdom) of heaven in their midst.
Hope that is more specific and helpful.
And what I am trying to tell you is that it is also applied to us.
We have Paul, Peter, John, Jude, Revelation, Genesis, and the prophets, and the spirit of God in me confirming, these all telling me/us it's for this age, but for some reason your telling me/everyone it's not for this age, but a 1,000 years from now.
You will need to have some mighty great evidence/word to show otherwise. Cause there is nothing in there that says it cannot be applied to this age, though you think so (this doctrine you received from man (I know of this doctrine), but my doctrine is not of this world, but came down from heaven, and is true. You have been fed a little bit here, and a little bit there (to and fro), but I have been fed to the full).
Look what Paul say here in Romans, he is saying the very same thing can happen to us in this age (cause this is how God works, Who is no respecter of persons, and is the same to day as yesterday, and it is He Who sends into Babylon, and delivers)...
Romans 11:17 And if some of the branches be broken off [Jews], and thou, being a wild olive tree [Gentiles], wert grafted in among them, and with them partakest of the root and fatness of the olive tree;
18
Boast not against the branches [Jews (you need to take warning, for this is the very thing you are doing)]. But if thou boast, thou bearest not the root, but the root thee.
...And Your saying it it does not apply to the church in this age...
20 Well; because of unbelief [not believing the
truth, God's testimony; how many denominations? 2 Thess. 2] they were broken off, and thou standest
by faith [being in love with the
truth]. Be not highminded, but fear:
21 For if God spared not the natural branches [Jews],
take heed [you need to be aware, take heed, in this age, "stay awake!" "be vigilant!" But you are refusing to taking heed, your head is a 1,000 years away from now, this is what I am trying to warn you of, but you are refusing] lest he also spare not thee [Gentiles].
22 Behold therefore the goodness and severity of God: on them [Jews (Vipers!) those that were cut off] which fell, severity; but toward thee [Gentiles those that were grafted in], goodness,
if thou continue in his goodness: otherwise thou [Gentiles] also
shalt be cut off [are you hearing? are you able? Did you quench the spirit (I say only that you would check with yourself. If you still know of your sins, and know you are still practicing them, then you have not overcome the world, Christ has not been formed in you, still being a child tossed to and fro in doctrine, not understanding)?].
25
For I would not, brethren, that ye should
be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel,
until the fulness of the Gentiles be come in.
Paul is telling you himself it could happen to the cuurch, then states it will happen, because Paul knew something Acts 13:40-41. And if you wish, you could also add, that the falling away comes first.