From the Old Testament reading at Evening Prayer:

In the evening quails came up and covered the camp; and in the morning there was a layer of dew around the camp. When the layer of dew lifted, there on the surface of the wilderness was a fine flaky substance, as fine as frost on the ground. When the Israelites saw it, they said to one another, ‘What is it?’ For they did not know what it was. Moses said to them, ‘It is the bread that the Lord has given you to eat.
(Exodus, chapter 16, verses 13-15, NRSV)

Is our first reaction, when God gives us something, suspicion?

This glass is in the chapel of St. John’s College, Cambridge.