Fasting with no effect
If it happens that the holy month arrives and one tolerates hunger, thirst and lack of sleep for thirty days, and stays up late every night and goes from one religious gathering to the next, and by the time the day of eid al-fitr arrives, a person has not changed one bit since the last day of Sha’ban, then such fasting has no effect on a person.
Ayatullah Shahid Mutahhari