The prophet said: Verily Allah said to the world, tire and wear out the one who serves you, and serve the one who rejects you. (Amali al saduq, page 230 #9)
Does this mean that we shouldn't work hard to achieve anything in this life? What is the meaning of this hadith?

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We should work hard in this dunya with the niyyat of pleasing Allah then it would be ibadat.