The Acts of the Heart, by Sheikh Ibn Taymiyya
There are many who are heedless about caring for the acts of the heart, although they are part of faith and are even what first enters into faith. Ibn Taymiyyah said: "And it is necessary that enter into his saying: "... belief of the heart... " The acts of the heart which accompany the belief of the heart, such as the love of Allah, the fear of Allah, place one's trust in Allah and others. It is more a priority that the acts of the heart enter into faith than the acts of the limbs, according to the consensus of all the groups. " ( Majnûn al-fatâwâ (7/506) .

The obligatory character of the acts of the heart is stronger than that of the acts of the members. This is the reason why Ibn Al-Qayyim says, clarifying this: "Whoever meditates on the sources and origins of legislation will know the connection of the acts of the limbs to the acts of the heart, that they are not useful without these last, and that the acts of the heart, they are more obligatory to the servant than the acts of the members. What differentiates the believer from the hypocrite, if not what is in the heart of each as acts What distinguishes them? Could anyone enter Islam without acts of the heart which precede those of his limbs? The bondage of the heart is more important than the bondage of the limbs, more abundant and more persistent. It is obligatory at all times"

“If the heart is virtuous, because of what is there as faith by science and acts of the heart, it will necessarily involve the virtue of the body through the outward words and the application of absolute faith. As the Imams of the adepts of Hadith said, “Words and deeds, inner and outer words, inner and outer deeds,” and what is external follows and is implied by what is internal. When the inside is virtuous, the outside will be virtuous, and if it is corrupt, it will be corrupt.”

(Majnûn al-fatâwâ (7/187)