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Eat thy bread with quaking - Assume the manner of a person who is every moment afraid of his life, who has nothing but a morsel of bread to eat, and a little water to drink. Thus signifying the siege, and the straits to which they should be reduced. See this explained, Ezekiel 12:19; (note).

Here the sign is the exhibition of such terror as the danger of a siege creates.

The prophet must eat and drink in care and fear, with trembling, that he might express the condition of those in Jerusalem during the siege. When ministers speak of the ruin coming upon sinners, they must speak as those that know the terrors of the Lord. Afflictions are happy ones, however grievous to flesh and blood, that improve us in the knowledge of God.