الا وان في الجسد مضغة اذا صلحت صلح الجسد كله، واذا فسدت فسد الجسد كله، الا وهي القلب.
In the body there is a small piece of flesh; if that piece of flesh is rectified then the whole body will be rectified and if it becomes corrupt then the whole body will become corrupt, and truly that is the heart.
” - Prophet Muhammad (s)