Attainment of Happiness is the most valuable book on the topic of Islamic Monotheism. The very accomplished author of this book was a very well-known Islamic scholar and jurist of the present day. Shaykh Salaah Al-Budair has chosen the ahadeeth in this book with due care and diligence. In order to compile these ahadeeth, he has very meticulously studied almost the entire stock of hadith literature available. Like an expert gems dealer, Shaykh Salaah has chosen only those hadith for the purpose of explaining a particular topic, which was the most relevant in terms of their meanings and context. For this purpose, on some occasions, a single hadith has been taken from many different books of Hadith.