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With a little help from an encyclopedia this week, I learned something about thirst. The sensation of thirst occurs when there is a loss of water from the blood cells of our body. As those cells pass by a particular censor in the brain, the censor alerts the body that water needs to be added. First, there’s the dry mouth and a craving for fluids. Then there is decrease in the production of saliva and then difficulty swallowing.
If the body still doesn’t get the liquid it wants, it begins to suffer dehydration. The skin becomes dry and wrinkly. A fever develops, sweating stops, kidneys shut down, and death can result.
The thing that surprised me is that dehydration takes place with the loss of only 8% of the body’s water content. And under normal conditions, with no water intake, we loose 2.5% of the body’s water content per day. If it’s dry or we perspire a lot due to heat or activity, it goes up from there. That means that even under very ordinary conditions, we could experience fatal dehydration levels within 3 days of no water intake.
I. Israel in the desert
A. Exodus 15 ‘ Bitter water made sweet
Now maybe we can understand Israel’s complaint in the desert. Exodus, chapter 15 we read that after passing through the Red Sea, Israel entered the desert and for 3 days they couldn’t find any water. Finally, they came to a lake but the water was polluted (or bitter in the Hebrew) and they couldn’t drink it. And so they ‘grumbled’ against Moses saying, ‘What are we to drink.’ They were dehydrating! The Lord told Moses to do a very strange thing. Moses took a piece of wood and threw it into the polluted lake and the water, miraculously became ‘sweet.’ And all Israel drank and were renewed.
And if you were to listen carefully you could hear a faint, distant voice saying, “If anyone thirsts, let him come to me and drink.’ Continue reading