Learning the Obligatory Knowledge of the Religion puts the Muslim on the road for excellence and self-betterment. With knowledge, the Muslim differentiates between what is lawful and what is not, and what is an acceptable, valid worship and what is not. What differentiates one Muslim from another is the amount of Islamic knowledge one attains and applies within one's own life. "The Essentials of Belief" is an insight into the Religion of Islam. Believing and uttering 'No one is God except Allah and Muhammad is the Messenger of Allah' is the most important thing any person can do and it is a condition for the acceptance of the good deeds. The one who becomes Muslim and stays Muslim will have the enjoyment of Paradise without end in the Hereafter and the one who rejects Islam will suffer the torture of Hellfire without end in the Hereafter. It is certain that death will come to all of us. The one who is prepared for the Day of Judgment is the one who knows, accepts, and applies the essentials of belief, and implements the teachings of Prophet Muhammad, sallallahu ^alayhi wa sallam, in all sincerity to Allah, the Exalted.