The statement actually applies to the text by revealing that one is in a place where what he needs is available but he is lamenting and regretting for not getting what he wants.
The statement was taken from "A Piece of Chalk".
"A Piece of Chalk" is a known to be classic writing of G.K. Chesterton. It actually portrays the importance and interest people have in small things.
From the given statement, the speaker reveals that one is in a desert place (Sahara) where there is sand and still regrets and complains of no sand in his hour-glass.
This depicts that one has what he needs but still complains of want.
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