Some scientists and news commentators predict that while wars today are often fought over sources of oil, future wars (in the not very distant future) will be fought over sources of water - not salty ocean water that covers about ¾ of the earth's surface, but fresh water for the survival of the billions of humans on earth - an increasingly drought-plagued earth.
The struggle for control of water supplies is nothing new however, as proven in this example from the time of Isaac:
"26:19 And Isaac's servants digged in the valley, and found there a well of springing water. 26:20 And the herdmen of Gerar did strive with Isaac's herdmen, saying, The water is ours: and he called the name of the well Esek; because they strove with him. 26:21 And they digged another well, and strove for that also: and he called the name of it Sitnah." (Genesis 26:19-21 KJV)
"For now the LORD hath made room for us, and we shall be fruitful in the land"
After Isaac and Rebekah (see She Is My Sister) departed from the Philistines in Gerar (where Isaac had resorted because of a famine in their own land), Isaac almost immediately came into conflict over sources of water.
"26:16 And Abimelech said unto Isaac, Go from us; for thou art much mightier than we.
Isaac wasn't looking for a fight however. He just kept moving until he found, not only water, but peace.
"26:22 And he removed from thence, and digged another well; and for that they strove not: and he called the name of it Rehoboth; and he said, For now the LORD hath made room for us, and we shall be fruitful in the land." (Genesis 26:22 KJV)
It was there that the LORD (see 'The God Of The Old Testament') appeared to Isaac to assure him that "I am with thee, and will bless thee."
"26:23 And he went up from thence to Beersheba. 26:24 And the LORD appeared unto him the same night, and said, I am the God of Abraham thy father [see 'Before Abraham Was, I AM']: fear not, for I am with thee, and will bless thee, and multiply thy seed for my servant Abraham's sake.
Isaac's enemies also realized (i.e. were given to realize) that they should make peace with Isaac ("We saw certainly that the LORD was with thee"), a lesson that applies to anyone who genuinely obeys the LORD. When a nation truly obeys the LORD, rather than arrogantly claiming to be the LORD's people on their own rebellious "it's right if we say it is" terms, their borders and their people will always be safe and secure.
"26:26 Then Abimelech went to him from Gerar, and Ahuzzath one of his friends, and Phichol the chief captain of his army.
Fact Finder: What was the difference between a well and a cistern?