Isaiah 25 sounds like a Psalm of praise.  God’s people are exalting God because of all the “wonderful things” He has done for them.  After two expressions of intentions (“I will…I will…” in v. 1), a series of explanations (“For you have…”) make up the largest part of the praise-prophecy.  When you arrive at v. 6, the prophecy shifts to what the Lord will do.  Verses 6-8 present a quality of life that everyone wants to experience.  Isaiah is urging the Church to be sure they will be there in that day.  Verse 9 presents the condition: “…this is our God; we have waited for him…”  Isaiah intends for their future confession to be our confession now.