Because doing so prevents differences from festering like an untreated, infected wound.
(‏ اف ٤ :‏ ​ ٢٦ ،‏ ٢٧‏ )‏ وَقَالَ يَسُوعُ :‏ « سَارِعْ إِلَى تَسْوِيَةِ ٱلْأُمُورِ مَعَ ٱلْمُشْتَكِي عَلَيْكَ » .‏