Islamic Quiz Weekly #8: Pillars of Imān-1
Imān is to be understood as referring to inward submission, which is affirmation in the heart and deeds of the heart, which only comes from one who is a true believer.
"The Messenger believes in what has been sent down to him from his Lord, and (so do) the believers. Each one believes in Allaah, His Angels, His Books and His Messengers. They say, ‘We make no distinction between one and another of His Messengers’ – and they say, ‘We hear, and we obey. (We seek) Your forgiveness, our Lord, and to You is the return (of all).’" [al-Baqarah 2:285]