The people to whom Ezekiel is prophesying are in exile—separated from the Holy Land. To return to the land of Israel is to be resurrected to new life, to be restored.
The preceding pericope uses the metaphor of a “mighty man,” a “warrior” for the LORD and this is not too much of a stretch for us. However, our text begins with the metaphor of a woman in child birth.
Paul seems to think singing is an excellent way of practicing and truly nurturing the Christian faith. His thought is that the life, death, resurrection and reign of Christ are the songs in the heart of those who are enlightened.