“God with us” is true when the people is at rest. It is also true when the enemy invades and devastates its land. It is always true, in spite of and in the most irresistible movements of history. It is so because and to the extent that in all these things there is revealed the gracious action of God to His people. No matter who or what is concretely envisaged in these passages, they obviously mean this: Emmanuel is the content of the recognition in which the God of Israel reveals Himself in all His acts and dispositions ; He is the God who does not work and act without His people, but who is with His people as their God and therefore as their hope.
-Karl Barth, CD IV.1 p. 3