Many churches throughout the world use a Bible reading schedule called a "lectionary." It's just a fancy word meaning "selected readings." Posts like this reflect on the readings for an upcoming Sunday or other Church holiday, as found in the three-year lectionary.
In Psalm 91 the Psalmist speaks of God as the greatest defense we could ever have. He is a shelter. As a bird will cover her young with her wings, protecting them from every danger, the Lord will spread his wings over his people, covering them and guarding them.
The metaphor changes rather quickly from God as a bird to a military shield. No matter the destruction which can come upon someone, God is the protector of his people. This applies not only to military action, which is itself terrrifying. It also applies to disease, plague, and other types of destruction. These are especially frightening forces as they are invisible. At least with a military enemy it may be possible to see the opponent coming and hide. But when people fall prey to diseases they cannot see what is actually attacking them.
No matter how vast the destruction, no matter how unpredictable, no matter how terrifying, God is the protector of his people. The LORD, the most high, is our refuge.
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