The Trials of Life by Sheikh Saalih Al-Fawzan,
There are great trials which a person faces, so it is obligatory for him to have knowledge of them so that he is able to stay clear and overcome them if he is trialed. So, one must first have knowledge and insight of Islam, its rules and regulations. One must know those things which turn us away from Islam and the barriers which obstruct the servant of Allaah from worshipping Him. One must know the things that affect their faith, such as sins, in order to keep away from their harm and reap the benefits (of being steadfast). If a person does not know those affairs that can harm and misguide him, they may destroy him. Allaah ordered us to hold fast to this religion until we die.