The dew represents the richness of God’s blessings (his goodness and care). In Jerusalem, this moisture comes from winds off the Mediterranean Sea. Mount Hermon, which has snow on its peak, is known for its abundant moisture.
A blessing is God’s life-giving power. It shows his provision (care for needs) and protection (Psalm 5:12; 41:2). It also comes from his presence (21:6; 67:1). In the end, all nations will receive God’s blessing (Psalms 67; 72:17). Zion is the central place of God's blessing (Psalms 134:3; 147:13).
God gives everlasting life to people.