Imam Al-Sadiq

mentioned matters, claiming that people at that time had no knowledge to prove such matters.
But they forgot that Imam 'Ali learned his knowledge directly from the Prophet, may Allah
bless him and his family, who said: "I am the city of knowledge and 'Ali is its gate."
The children of Imam 'Ali had the same degree of knowledge about the existence of Allah.
So, they taught people what they wanted about the existence of Allah. That is because it is
illogical for people to worship the Lord whom they do not know, obey the prophet whom they
do not know, and follow the Imam whose position they do not understand deeply. So, to know
Allah is the first and the best science. Al- Sadiq, peace be on him, said: "The best worship is
to know Allah."(195) Hearing is not one of the rules and fundamentals adopted to know the
existence of Allah. That is because the wise men say it is not right for people to copy others in
the rational matters.
People may use Koranic verses and traditions as evidence for the existence of Allah. But such
verses and traditions guide man to use his intellect or they indicate the instinct like this verse:
"Is there doubt about Allah, the Maker of the heavens and the earth?" Such a verse does not
force you to believe in the existence of Allah. Rather, it draws your attention to that through
showing Allah's creatures like the sky and the earth.(196)
When the Prophet and his family produced evidence for these fundamentals, they urged man
to adopt the judgment of intellect. Now listen to the following words of al- Sadiq ,peace be on
him, in this respect: "Intellect is the guide of the believer. The pillar of man is intellect. He
who does not think does not succeed."(197) If you read what al- Kazim, peace be on him, told
Hisham b. al- Hakam about intellect and the wise, you will know that (ahl al Bayt ) knew the
reality of intellect. So, they guided and urged men to make use of its light.(198)
Ahl al Bayt produced much evidence for these fundamentals (i.e. the existence of Allah, His
Oneness, etc.). We may find such evidence in books like 'Nahj al Balagha' by Imam 'Ali, 'Al-
Ihtijaj' by al- Tubrisy, 'Isul al- Kafi', 'Al- Tawhid' by al- Saduq, the first and the second
volumes of 'al-Bihar', and so on.
The following are some brief proofs of al- Sadiq, peace be on him, on the above- mentioned
fundamentals.
Existence and Oneness of Allah:
Al- Sadiq, peace be on him, had many proofs about the existence and oneness of Allah, the
Exalted. Some of them are: Tawhid al- Mufaddal- It is a group of lessons. Al- Sadiq gave
them to al- Mufaddal b. 'Amr al- Ju'fy al- Kufi, who was among the companions who had
both action and knowledge. His (al- Sadiq's) message called al- Ihlija which al- Mufaddal
reported, too. Al- Mufaddal learned Tawhid (the Oneness of Allah) from al- Sadiq orally and