This is second book of Al-Ghazali's magnum opus The the Revival of the Religious Sciences or Ihya Ulum al-Din. Known as Kitab Qawa'id al-Aqai'd or The Principles of the Creed.
In chapter 1, Al-Ghazali presents a succinct summary of the essential aspects of the Muslim creed, (the Arabic text also appears on facing pages). Chapter 2 discusses how religious instruction should be imparted gradually, the stages and levels of conviction, the ruling on studying debate and theology, the outward and inward creed, and the difference between the two. Chapter 3, the Jerusalem Epistle on the Principles of the Creed (al-Risala al-qudsiyya fi qawa'id al-'aqa'id), is a detailed exposition consisting of four pillars: the recognition of the essence of God, the knowledge of the attributes of God, the knowledge of the acts of God, and belief based on transmitted reports about God from the Prophet. Chapter 4 examines faith and Islam, what connects and separates them, whether faith can increase and decrease, and whether the predecessors qualified their claims to faith.