Those who strive only for the purpose of worldly gains can be rewarded by God merely in this word!

No other religion or way of life except His prescribed one is acceptable to Him! 

 

Verses 19-21 of Chapter 42:

Allah is very Gracious and Kind to His servants. He gives provisions to whom He wills. And He is the All-Strong, the Almighty. Whosoever desires the reward of the Hereafter, We give him increase in his reward, and whosoever desires the reward of this world, We give him thereof, and he has no portion in the Hereafter. Or have they partners with Allah who have instituted for them a religion which Allah has not ordained And had it not been for a decisive Word, the matter would have been judged between them. And verily, for the wrongdoers there is a painful torment.