As one reference work states, it is “the sum total of the interior man. ” In some cases, “heart ” has a narrower meaning.
٥ لِمَاذَا نُرِيدُ أَنْ نَبْذُلَ قُصَارَى جُهْدِنَا لِنَخْدُمَ يَهْوَهَ بِقَلْبٍ كَامِلٍ ؟‏