Eternal Joy and New Creation

Isaiah 55:12-13

For with joy ye go forth, And with peace ye are brought in, The mountains and the hills Break forth before you with singing, And all trees of the field clap the hand.

Instead of the thorn come up doth fir, Instead of the brier come up doth myrtle, And it hath been to Jehovah for a name, For a sign age-during--it is not cut off!