In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
The knowledge of Sound Creed
This is the noblest of all affairs of knowledge without exception; the most virtuous and perfect. By way of it, hearts firmly cling to sound creed, [noble] manners are purified and made to flourish, and deeds are perfected. The subject matter is based on the following:
To study that which is obligatory to affirm for Allaah regarding His perfect Attributes and Lofty Characteristics, and that which makes it impossible for Him to be described with deficient and blameworthy attributes, or likening Him to others.
Study that which establishes the fact that Allaah [alone] originated all creation and that He does whatever He wills-whatever He wishes will take place and whatever He does not wish cannot take place.
Likewise, study what is obligatory regarding belief in the Messengers- their qualities and the rights due to them, and that which is forbidden with regards to violation of such rights.
Belief in the Books revealed to the Messengers and in that which Allaah has stated about Himself, and that which His Messengers stated regarding the events of the past and the future.
Belief in the last day, recompense, reward and punishment, the paradise and hell fire, and that which has been stated [in the Qur’aan and authentic Sunnah] related to these affairs.
These are the general affairs of this lofty affair of knowledge. Indeed the Qur’aan has explained these affairs with a profound explanation and clarified it in a manner that is not equal to [its explanation and clarification in] the other revealed books.
[An Excerpt from ‘Fat-hul Raheem Al-Malikil Allaam Fee Ilmil Aqaa-id Wat-Tawheed Wal-Akhlaaq Wal-Ahkaam’. Page: 7. slightly paraphrased]