Our God has made many promises that have been recorded as part of the Scriptures. Some are for us, some aren’t. Claiming the curses He has promised Moab as pertaining to us is a bad idea. Claiming some of the blessings that He has promised certain people in certain situations may not be appropriate. We can ask for the good stuff, even if He wasn’t talking to us – “Lord, You did that for them, would You do it for me?”, but claiming it as a promise to us is not right if He wasn’t talking to us.
This one, in Isaiah 54, is to us. His servants have this promise by His declaration. Have it! Be covered by His protection and blessing.