From Imam Sadiq (prayers of Allah be upon him): “By Allah, if one of you had two souls, he would fight with one to test it, and then the other remained and he acted according to what was clear to it, however he has only one soul, if it goes away, then by Allah, repentance has gone away, so you are more entitled to choose for yourselves…” [Al-Kafi] والله لو كانت لاحدكم نفسان يقاتل بواحدة يجرب بها ثم كانت الأخرى باقية فعمل على ما قد استبان لها ولكن له نفس واحدة إذا ذهبت، فقد والله ذهبت التوبة فأنتم أحق أن تختاروا لأنفسكم،