If Allah were to grant ample sustenance to His servants they would go about transgressing in the land. But He sends down in due measure whatever (sustenance) He wills. Surely He is Well-Aware and All-Seeing concerning matters that relate to His servants.
QURAN [42:27]
ولو بسط اللـه الرزق لعباده لبغوا في الأرض ولكن ينزل بقدر ما يشاء ۚ إنه بعباده خبير بصير ﴿٢٧﴾سورة الشورى
