Eternity means that some things are changing all the time. Leaders and laws change. Social conditions, the rise and fall of nations, all of the individual injustices and problems that make up our daily lives. And those things all matter. But from God's point of view, and from the Christian's point of view, in a way all those things are like the weather.
Some days are better than others.
Some seasons you have to stay inside sit it out. God adapts, and we adapt in faithfulness, to all of the changes that come our way. But eternity also means that some things never change. God's steadfast love never changes. God's will for peace is always the same.