Imam Husayn (a.s.) said:
مَنْ حَاوَلَ أَمْراً بِمَعْصِيَةِ اللّهِ كانَ أَفْوَتُ لِما يَرجُو و اَسْرَعُ لِما يَحْذِرُ
One who looks to performing something through disobedience to God, will lose whatsoever he desires sooner ; and, whatsoever he fears , will happen to him sooner.1
Some people suppose that if they use unlawful means for obtaining their goals, they will attain their ends sooner. However, above tradition says that in fact such ways will expedite the loss of their ill-gotten objects and their fears will also materialize sooner. For example, he seeks tranquility from earning unlawful wealth, yet first of all he loses tranquility as a result of it and is involved in distress and anxiety which he had feared.