Meaning: People have spiritual needs as well as physical needs.
Jesus answered: "It is written: Man does not live on bread alone, but on every
word that comes from the mouth of God." - Matthew 4:4, New International Bible.
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David Crystal's book "Beget" listed three places where this phrase is found in
the Bible: Deuteronomy, Matthew, and Luke, and told some interesting modern
usages, mainly exploitations by the food industry.
The diary farmers, e.g., would argue in their ads: "Men does not live by bread
alone, but should also have plenty of cheese."