“For your Maker is your husband -”
This really spells out the spiritual marriage relationship between believers and Jesus or between Jesus and His church.

“For a brief moment I abandoned you..”
Wonder how long God’s moments are? 

"Though the mountains be shaken and the hills be removed, yet my unfailing love for you will not be shaken nor my covenant of peace be removed," says the Lord, who has compassion on  you.

What follows after this is a description of the millennium:

City with stones of turquoise, foundations with sapphires, battlements of rubies, gates of sparkling jewels, walls of precious stones.  While this is a beautiful picture, even better than that is the following:  "All your sons will be taught by the Lord, and great will be your children's peace."

Notice it says ALL your sons will be taught by the Lord and great will be their peace.  What parents wouldn't want that for their children?

Isaiah 55 paints a picture of somewhat of a bartering system that will be in place in the millennium.

Isaiah 55:2
Why spend money on what is not bread, and your labor on what does not satisfy?
This is a very applicable question for today.  How much money do we spend on wants instead of needs?  How much time do we spend on the job to make money to buy things that do not satisfy?
 

“Seek the Lord while he may be found”;
What does it mean “while he may be found”? Does it mean there may come a time when He can’t be found?

Isaiah 55 continues to paint a beautiful picture of mountains and hills bursting into song. “…all the trees of the field will clap their hands.” What a sound that must be!
This chapter also tells us that there will be a absence of thorns and briers. 

Isaiah 56 reaffirms God's desire that we keep His Sabbaths and His Holy Days.  He promises to bring those who honor these days to his holy mountain to be close to Him.

It is quite obvious throughout Scripture how God feels about His Sabbaths and the feasts and festivals. These days will be honored during the millennium.  Why not honor them now?