Iman (Faith) is the "Belief" in the heart that is confirmed by the tongue and manifested in actions. It has six pillars: belief in Allah, His Angels, His Books, His Messengers, the Last Day, and the Divine Decree. Iman is not a static state; it is believed to increase with good deeds and decrease with sins. It is the spiritual engine that drives a Muslim to persevere through the trials of life. The six pillars of Iman are derived from the Quran and the famous Hadith of Jibril. Belief in Allah encompasses Tawhid (oneness) and all His attributes. Belief in angels includes acceptance of their existence, roles, and that they are honored servants of Allah. Belief in His Books affirms all revealed scriptures, with the Quran as the final and preserved revelation. Belief in His Messengers recognizes all prophets sent to humanity, with Muhammad as the final messenger. Belief in the Last Day includes faith in death, the grave, resurrection, judgment, Paradise, and Hell. Belief in Divine Decree (Qadr) encompasses acceptance that Allah knows all, has written all, and wills all that occurs, both good and apparent evil, while affirming human responsibility and free will. Iman is not merely intellectual assent but requires affirmation by the tongue (the Shahada) and action by the limbs (righteous deeds). The Quran frequently pairs Iman with righteous deeds (amal salih), indicating their inseparability. Iman increases through obedience, seeking knowledge, reflecting on Allah's signs, and accompanying the righteous. It decreases through sin, heedlessness, and doubt. The believer's Iman fluctuates, requiring constant renewal and protection. True Iman brings tranquility, purpose, and resilience. It transforms fear into hope, despair into trust, and uncertainty into conviction. It is the foundation upon which all Islamic practice rests, and its cultivation is the ultimate purpose of life.