In Isaiah’s time, King Ahaz wanted to align himself with Assyria in order to ensure protection for his people. Isaiah was against this move, insisting that God would protect them. He told Ahaz that a sign from God would confirm this. A young woman (or virgin, from the Hebrew word almah) would bear a son who would be called Immanu el, or “God is with us.” Since the people believed that God was with the king in a special way, the reference is probably to Ahaz’s son. Thus, Ahaz was told that the child his young wife is carrying would be a son who would be a sign of God’s protection. Furthermore, since kings were usually anointed, this child like every king before him will be considered an anointed one, translated messiah.
The promise made to Ahaz is fulfilled in Jesus as today’s gospel reading announces. Jesus is “God with us,” the long-awaited Davidic messiah, the savior of his people as his Jewish name Yeshuah (“one who saves”) indicates. His realm is not limited to one kingdom as was Ahaz’s, nor to one people, as the Israelites thought. His realm embraces all creation; this universality, and his saving power, is outlined in the responsorial psalm. Christ is Lord over the entire earth: the whole world and those who are a part of it – and even beyond.
All the more reason why we, as followers of Christ, are called to recognize the intrinsic value of creation and uphold our duty to care for earth, our common home.