Charles Ellicott Commentary Isaiah 48:6

"Thou hast heard it; behold all this; and ye, will ye not declare it? I have showed thee new things from this time, even hidden things, which thou hast not known." — Isaiah 48:6 (ASV)

Thou hast heard ... —The appeal is to the conscience of the exiles. They had heard the prediction. They are urged to consider it all. Should they not declare the impression it had made on them?

I have shewed thee. —Better, I show you, as a present incipient act.

New things. —The “new things” are those that lie in a more distant future than the conquests of Cyrus, which are referred to as “former things.”