that which is in part shall be done away

1 Corinthians 13:9-12

9 For we know in part, and we prophesy in part.

10 But when that which is perfect is come, then that which is in part shall be done away.

11 When I was a child, I spake as a child, I understood as a child, I thought as a child: but when I became a man, I put away childish things.

12 For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known.

That which is in part shall indeed be done away with, but only after that which is perfect is come.  

How will we know that which is perfect has come?  We shall see Him face to face.

Revelation 22:4 And they shall see his face; and his name shall be in their foreheads.