" On the Day of Judgment no one is safe save the one who returns to God with a pure heart. (Quran)

Surely in the breasts of humanity is a lump of flesh, if sound then the whole body is sound, and if corrupt then the whole body is corrupt. Is it not the heart? (Prophet Muhammad )

Blessed are the pure at heart, for they shall see God. (Jesus ) "

― Hamza Yusuf , Purification of the Heart: Signs, Symptoms and Cures of the Spiritual Diseases of the Heart