Condition of heart: Truth and Iman( Faith)
Al-Imām ibn al-Qayyim [may Allāh have mercy on him] said:
*“The heart of a truthful person is filled with the light of truth and therein it has the light of true faith.”*
Madārij as-Sālikeen, 2/282 | Al-Imām ibn al-Qayyim [may Allāh have mercy on him]