Do you think that you could enter paradise unless God takes cognizance of your having striven hard [in His cause], and takes cognizance of your having been patient in adversity?
Al-Imran (The Family of Imran) Verse 142
The Prophet said, "A time will come when one will not care how one gains one's money, legally or illegally."
Sahih Bukhari: Volume 3, Book 34, Number 275