There is a famous story that a noble man hosted a feast. He illuminated forty oil lamps. Some people commented, ‘There should not be this much extravagance.’ He replied, ‘Put out the lamp that I have lit in pretense.’ People tried to put out the lamps, but not a single lamp could be extinguished.
It seems that though it is the same action that is carried out by two individuals, the act of one individual becomes evil whereas others deserve a reward from God. The difference between their intentions causes this difference.
(Malfuzat, Vol. 4, p. 47)