Here I want to quote an essay:
"When is that time?
One respected tradition says that the coming of perfection or completeness refers to the coming of the day when Scripture is complete, that is, when the last inspired writings are gathered into the Bible and the canon of Scripture is closed. Let me quote from one of these writers whom I highly respect:
When Scripture is completed, then the church will have revelation thoroughly suited to her condition on earth. Our completed Bible is perfect in the sense that it is utterly sufficient revelation for all our needs. Paul is saying, "When the sufficient comes, the inadequate and partial will be done away. Tongues will vanish away, knowledge [and prophecies] will cease at the time that the New Testament is finished."
So when verse 10 says, "When the perfect comes," they say it means, "When the perfect New Testament comes." Is that what Paul means by perfect?
The other view says that the coming of the perfect refers to the experience of perfection at the return of Christ.
So you see what is at stake in these two interpretations. If the coming of the perfect in verse 10 refers to the finishing of the New Testament, then the gifts of prophecy, tongues and knowledge have all passed away because that time came 1900 years ago. But if the coming of the perfect in verse 10 refers to the second coming of Christ then the natural understanding of the text is that the gifts will continue until Jesus comes.
Let's test these two suggestions by the rest of the passage.
In the next verse (11) Paul says, "When I was a child, I spoke like a child, I thought like a child, I reasoned like a child; when I became a man, I gave up childish ways." Paul compares the experience of partial prophecy and knowledge to the experience of childhood, and he compares the passing away of these gifts to the experience of adulthood. That comparison doesn't seem to decide the issue for us.
Let's go to the next verse. Verse 12: "For now we see in a mirror dimly, but then face to face. Now I know in part; then I shall understand fully, even as I have been fully understood." Now this is really helpful in making our decision! Here in verse 12 Paul is describing what verse 10 refers to, namely, "when the perfect comes."
I want to make sure that you see this. Notice the contrast in verses 9 and 10 between "our knowledge is imperfect" (v. 9) and "when the perfect comes, the imperfect will pass away" (v. 10). Then drop down to verse 12 and notice the same contrast in the second part of the verse: "Now I know in part" contrasts with "then I shall understand fully." So verse 12 is clearly describing the coming of "the perfect" referred to in verse 10.
Now does the description of the coming of the perfect in verse 12 fit with the second coming or with the completing of the New Testament?
Let's take the two halves of the verse one at a time. First it says, "Now we see in a mirror dimly, but then face to face." Is it more likely that Paul is saying, "Now before the New Testament is written we see in a mirror dimly, but then when the New Testament is written we shall see face to face"? Or is it more likely that he is saying, "Now in this age we see in a mirror dimly, but then when the Lord returns we shall see face to face"? In the Old Testament there are half a dozen references to seeing God "face to face". Revelation 22:4 says that in heaven we shall see God's face. 1 John 3:2 says that when Jesus appears we shall be like him for we shall see him as he is.
My conclusion is that the contrast between seeing fuzzily in an old mirror made out of metal and seeing face to face is not a contrast between first century spiritual knowledge and the knowledge we have from the New Testament today, but rather it's a contrast between the imperfect knowledge we have today in this age and the awesome personal knowledge of God we will have when the Lord returns.
The second half of verse 12 points in the same direction. It says, "Now I know in part (the very same words used at the beginning of verse 9); then I shall be understand fully, even as I have been fully understood." Now is this a contrast between before and after the New Testament or before and after the second coming?
It's hard for me to imagine Paul or any of us saying that after the New Testament was written we now in this age understand fully, even as we have been fully understood. This surely refers to knowing in some sense the way God knows us not omniscience; it doesn't say we will know everything. But we will "be freed from the misconceptions and inabilities to understand (especially to understand God and his work) which are part of this present life . . . [Our knowledge] will contain no false impressions and will not be limited to what is able to be perceived in this age."
So my conclusion on this question is this: Paul is saying that prophecies will pass away not when the New Testament is completed but when this age is completed at the second coming of the Lord from heaven. That's when "the perfect comes" (v. 10). That's when all speaking and thinking and reasoning like a child will be put away (v. 11). That's when we will see "face to face" (v. 12a). That's when we will "know fully even as we have been fully known" (v. 12b)."
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God Bless
Till all are one.