[A Psalm of David.]
The LORD is my shepherd; I shall not want.
The word picture behind "I shall not want" is: "the fence (limitations) of the propped man".
Apart from our Shepherd we are faced with a poverty mind set of limitations or want.
If we stay in that place (of want) we eventually lose all sense of purpose and the life goes out of us.
Praise God that The LORD is my shepherd; I shall not want.