Mufaddal ibn Umar was a loyal companion of Imam Jafar Sadiq (asws). One day he overhears some atheists questioning the existence of a Divine Creator. Mufaddal then goes to Imam Jafar Sadiq (asws) to ask for guidance in how to respond to such accusations. Imam Jafar Sadiq (asws) explained to Mufaddal not only the existence of a Creator but the reason why each and everything exists and the purpose of every system from tears to saliva to animals to the universe. Mufaddal compiled the reply of Imam Jafar Sadiq (asws) into this book.