From the Holy Prophet (prayers of Allah be upon him and his household): “Whoever devotes himself sincerely to Allah for forty days, Allah will cause the springs of wisdom to flow from his heart to his tongue” [Bihar Al-Anwar]. عن النبي صلى الله عليه وآله قال: من أخلص لله أربعين يوما فجر الله ينابيع الحكمة من قلبه على لسانه.