Heart in Hadith (Traditions)

The pioneers of religion and real human specialists have left many interesting narrations about the heart. Following are some of the examples: In some of the narrations the hearts have been classified into three categories:
Imam al-Baqir (A) said:
"There are three kinds of hearts:
a: First type: Reversed heart which lacks feelings for any sort of righteous deeds. Such heart is the heart of a unbeliever.
b. Second Type: The heart which contains a black spot in which a war is being waged between the truth and falsehood, and whichever becomes victorious will take over the heart's control.
c. Third type: The conquered heart in which there is a lighted lamp which is never going to be turned off. Such a heart is the heart of a believer."
-Bihar al-Anwar, vol. 70, p-51.
Imam al-Sadiq (A) has quoted from his learned father:
"There is nothing worst than sinning for the heart. When the heart is encountered with sin, it struggles against the sin until sin becomes victorious thus, making the heart as a reversed heart."
-Bihar al-Anwar, vol. 70, p-54.
Imam al-Sajjad (A) has said:
"A man possesses four eyes, with two apparent eyes he sees the affairs relevant to his world, and with two esoteric eyes sees the affairs related to the Next World. Therefore, whenever God-Almighty desired the good for a believer, He opens his heart's eyes to enable him to witness the hidden world and its mysteries. But when He does not desire his welfare, leaves the heart with his esoteric eyes closed."
-Bihar al-Anwar, vol. 70, p-53.
Imam al-Sadiq (A) has said:
"The heart possesses two ears, the spirit of belief slowly invites him towards righteous deeds, while the Satan slowly invites him towards evil deeds. Therefore, whoever becomes victorious in this struggle takes over heart's control.”
-Bihar al-Anwar vol. 70, p-53.
Imam al-Sadiq (A) quotes from the Holy Prophet (S)
"The darkness of the heart is the worst kind of darkness.”
-Bihar al-Anwar, vol. 70, p-51.
Imam al-Baqir (A) said:
"Initially there is a white spot and light within the heart of a human being and as a result of his committing sin, a block spot appears. If the person repents the black spot gets wiped out, but if he persisted in sinning, the blackness gradually increases ultimately covering the entire white spot, When this happens the owner of such heart will never return towards goodness and become manifestation of the Quranic verse:

‘Nay, but that which they have earned is rust upon their hearts.’"
-al-Kafi, vol, 2, p-273.

The Commander of the Faithful Imam" Ali (A) has said:
"Every one who lacks self restraint and piety will have a dead heart; whoever have a dead heart will enter inside the Hell."
-Nahjul Balagha, saying 324
He further emphasized this matter in his last will addressing to his son:
“Oh my son! The poverty is one of the most horrible calamity,. But still severe than poverty is the bodily sickness; and the sickness of soul is harsher than the bodily sickness. Plenty of wealth is one of the God's blessing, but sound health is better than that, and the piety of heart is even superior than sound health."
-Bihar al-Anwar, vol. 70, p-51.
There is a narration quoted from Anas bin Malik from the Holy Prophet (S) who said:
"The prophet David (A) asked God; ‘Oh God! All the emperors possess treasure then where is Your treasure ? God-Almighty replied: ‘I possess a treasure which is greater than the sky; vaster than the Heaven's firmaments; smells better than the perfumes of Paradise, and is beautiful than the Celestial Kingdom. Its earth is enlightenment; its sky is belief, its sun is enthusiasm; its moon is love,. its stars are inspiration and attention towards Me; its clouds are reason,. its rain is blessing, its fruits are obedience; and its yield is wisdom. My Treasure has four doors, the first one is the door of knowledge, the second one is the door of reason, the third one is the door of patience, and the fourth one is the door of contentment. Know that My Treasure is -the heart of a believer' ".
-Bihar al-Anwar, vol. 70, p-59.