Psalm 23: "I shall not want" ?

Psalm 23 begins:

"The Lord is my Shepherd; I shall not want." (KJV)

For anyone who has studied the Bible in its original language:

I'd like a clearer understanding of how the "shall not" should be 
taken.  Is "I shall not want" to be read as a side-effect of the 
Lord's position with respect to us in our lives, or is it an explicit 
instruction that we should not want -- that the Lord is providing all 
the we need, and that we are not to want more?

Or something else entirely?

Thank you in advance for any insight offered.



















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